Found 43 papers in cond-mat


Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Observation of Cooper-pair density modulation state
Lingyuan Kong, Micha{\l} Papaj, Hyunjin Kim, Yiran Zhang, Eli Baum, Hui Li, Kenji Watanabe, Takashi Taniguchi, Genda Gu, Patrick A. Lee, Stevan Nadj-Perge
arXiv:2404.10046v1 Announce Type: new Abstract: Superconducting states that break space-group symmetries of the underlying crystal can exhibit nontrivial spatial modulation of the order parameter. Previously, such remarkable states were intimately associated with the breaking of translational symmetry, giving rise to the density-wave orders, with wavelengths spanning several unit cells. However, a related basic concept has been long overlooked: when only intra-unit-cell symmetries of the space group are broken, the superconducting states can display a distinct type of nontrivial modulation preserving long-range lattice translation. Here, we refer to this new concept as the pair density modulation (PDM), and report the first observation of a PDM state in exfoliated thin flakes of iron-based superconductor FeTe$_{\text{0.55}}$Se$_{\text{0.45}}$. Using scanning tunneling microscopy, we discover robust superconducting gap modulation with the wavelength corresponding to the lattice periodicity and the amplitude exceeding 30% of the gap average. Importantly, we find that the observed modulation originates from the large difference in superconducting gaps on the two nominally equivalent iron sublattices. The experimental findings, backed up by model calculations, suggest that in contrast to the density-wave orders, the PDM state is driven by the interplay of sublattice symmetry breaking and a peculiar nematic distortion specific to the thin flakes. Our results establish new frontiers for exploring the intertwined orders in strong-correlated electronic systems and open a new chapter for iron-based superconductors.

Berry-dipole Semimetals
Zheng-Yang Zhuang, Chaoyi Zhang, Xiao-Jiao Wang, Zhongbo Yan
arXiv:2404.10049v1 Announce Type: new Abstract: We introduce ''Berry-dipole semimetals'', whose band degeneracies are characterized by quantized Berry dipoles. Through a two-band model constructed by Hopf map, we reveal that the Berry-dipole semimetals display a multitude of salient properties distinct from other topological semimetals. On the boundary, we find that the first-order Berry-dipole semimetal harbors anomalous paired Fermi arcs with the same spin polarization, even though the layer Chern number is zero, and the second-order Berry-dipole semimetal hosts dispersionless hinge arcs. In the bulk, we find that the low-energy Berry-dipole Hamiltonian near the band node has a quadratic energy dispersion and peculiar Berry curvature, which give rise to rather unique characteristics in the intrinsic anomalous Hall effect, orbital magnetization and Landau levels. Our study shows that Berry-dipole semimetals are a class of topological gapless phases supporting rich intriguing physics.

Two-stage growth for highly ordered epitaxial C$_{60}$ films on Au(111)
Alexandra B. Tully, Rysa Greenwood, MengXing Na, Vanessa King, Erik M{\aa}rsell, Yuran Niu, Evangelos Golias, Arthur K. Mills, Giorgio Levy de Castro, Matteo Michiardi, Darius Menezes, Jiabin Yu, Sergey Zhdanovich, Andrea Damascelli, David J. Jones, Sarah A. Burke
arXiv:2404.10053v1 Announce Type: new Abstract: As an organic semiconductor and a prototypical acceptor molecule in organic photovoltaics, C$_{60}$ has broad relevance to the world of organic thin film electronics. Although highly uniform C$_{60}$ thin films are necessary to conduct spectroscopic analysis of the electronic structure of these C$_{60}$-based materials, reported C$_{60}$ films show a relatively low degree of order beyond a monolayer. Here, we develop a generalizable two-stage growth technique that consistently produces single-domain C$_{60}$ films of controllable thicknesses, using Au(111) as an epitaxially well-matched substrate. We characterize the films using low-energy electron diffraction, low-energy electron microscopy, scanning tunneling microscopy, and angle-resolved photoemission spectroscopy (ARPES). We report highly oriented epitaxial film growth of C$_{60}$/Au(111) from 1 monolayer (ML) up to 20 ML films. The high-quality of the C$_{60}$ thin films enables the direct observation of the electronic dispersion of the HOMO and HOMO-1 bands via ARPES without need for small spot sizes. Our results indicate a path for the growth of organic films on metallic substrates with long-range ordering.

Superpolarized Electron-Hole Liquid and Multiferroicity in Multilayer Graphene
Mainak Das, Chunli Huang
arXiv:2404.10069v1 Announce Type: new Abstract: We introduce a many-body state termed superpolarized electron-hole liquid to explain the multiferroic properties observed in a recent experiment on rhombohedral pentalayer graphene by Han et al. [Nature 623, 41-47, 2023] . Superpolarization refers to a state where electrons and holes are fully polarized in opposite directions within the extended spin-valley space, resulting in a polarization per charge that exceeds the saturated value of one. This state exhibits multiferroic order, characterized by spontaneous spin, layer, and valley polarization. We demonstrate the independent control of valley polarization and orbital magnetization in this state through the application of electric-displacement field and weak magnetic fields. The large magnetoelectric effect observed in the experiment is attributed to the substantial Berry curvature concentrated near the band edge. The concept of superpolarization can be probed experimentally through magnetic oscillation and local current distribution measurements to determine the area of the Fermi surfaces and their magnetic moments.

Rotational Superradiance in a Time-Reversal Symmetry-Broken Quantum Gas inside an Optical Cavity
Natalia Masalaeva, Farokh Mivehvar
arXiv:2404.10131v1 Announce Type: new Abstract: Appearance of quantized vortices in a superfluid and a Bose-Einstein condensate (BEC) stems from their nontrivial response to broken time-reversal symmetry (TRS). Here we show that breaking of the TRS by, for example, rotation or an external synthetic magnetic field in a transversely-driven BEC coupled to a single mode of an optical cavity modifies drastically Dicke-superradiance and self-ordering phenomena in this system. In particular, photon scattering from the pump laser into the cavity is amplified by the rotational motion of the BEC, leading to so-called 'rotational superradiance' - in a loose analogy to black-hole physics - with distinct critical scaling properties. Another notable finding is that cavity photons mediate long-range, periodic attractive interactions among the vortices, which compete with pair-wise logarithmic repulsive vortex interactions and deform the Abrikosov triangular vortex lattice favoring a stripe-like pattern. Remarkably, the rotation of the BEC and topological properties of the vortex lattice can be monitored nondestructively through the cavity output field.

Communicating skyrmions as the main mechanism underlying skyrmionium (meta)stability in quasi-two-dimensional chiral magnets
Kaito Nakamura, Andrey O. Leonov
arXiv:2404.10189v1 Announce Type: new Abstract: We re-examine the internal structure of skyrmioniums stabilized in quasi-two-dimensional chiral magnets with easy-axis uniaxial anisotropy. Skyrmioniums are particle-like states of two nested skyrmions with opposite polarities contributing to zero topological charge. The physical principles of skyrmionium stability are drawn from both the analytical analysis with a trial function and from numerical simulations within the framework of micromagnetism. We deduce that the radii of the internal skyrmion with the positive polarity and the ring-shaped external skyrmion with the negative polarity are mutually dependent, which constitutes the paradigm of communicating skyrmions. For large central skyrmions, the skyrmionium transforms into a narrow circular domain wall, whereas for small internal radii, the ring expands, which occurs at the verge of collapsing into an ordinary isolated skyrmion. We show that skyrmioniums may form lattices of two varieties depending on the polarity of the internal skyrmion. At the phase diagram (magnetic field)-(uniaxial anisotropy), both skyrmionium lattices share the same area with one-dimensional spiral states and remain metastable solutions for the whole range of control parameters. By expanding at the critical line, skyrmionium lattices do not release isolated skyrmioniums. Isolated skyrmioniums of just one type exist apart from the corresponding lattice in a narrow field region restricted by the critical line of expansion from below and by the line of collapse above.

Realization of nodal ring semimetal in pressurized black phosphorus
Kazuto Akiba, Yuichi Akahama, Masashi Tokunaga, Tatsuo C. Kobayashi
arXiv:2404.10192v1 Announce Type: new Abstract: Topological semimetals are intriguing targets for exploring unconventional physical properties of massless fermions. Among them, nodal line or nodal ring semimetals have attracted attention for their unique one-dimensional band contact in momentum space and resulting nontrivial quantum phenomena. By field angular resolved magnetotransport measurements and theoretical calculations, we show that pressurized black phosphorus (BP) is an ideal nodal ring semimetal with weak spin-orbit coupling, which has a sole and carrier density-tunable nodal ring isolated from other trivial bands. We also revealed that the large magnetoresistance effect and its field-angular dependence in semimetallic BP are due to highly anisotropic relaxation time. Our results establish pressurized BP as an elemental model material for exploring nontrivial quantum properties unique to the topological nodal ring.

Electronic states and quantum transport in bilayer graphene Sierpinski-carpet fractals
Xiaotian Yang, Weiqing Zhou, Qi Yao, Yunhai Li, Yunhua Wang, Shengjun Yuan
arXiv:2404.10333v1 Announce Type: new Abstract: We construct Sierpinski-carpet (SC) based on AA or AB bilayer graphene by atom vacancies, namely, SC-AA and SC-AB, to investigate the effects of interlayer coupling on the electronic properties of fractals. Compared with monolayer graphene SC, their density of states have similar features, such as Van-Hove singularities and edge states corresponding to the central peaks near zero energy, but remarkable energy broadening of edge states emerges in SC-AA(AB). Calculated conductance spectrum shows that the conductance fluctuations still hold the Hausdorff fractal dimension behavior even with the interlayer coupling. Thus, the high correlation between quantum conductance and fractal geometry dimension is not affected by the interlayer coupling in bilayer graphene SC. We further reveal the quasi-eigenstates in fractal-like pressure-modulated bilayer graphene, namely, SC-pAA and SC-pAB. Numerical results show that the density of states of SC-pAA(pAB) show an asymptotic behavior to those of SC-AA(AB) especially for high energy quasi-eigenstates. Within a certain energy range, stronger pressure can lead to stronger localization, forming an efficient fractal space.

Spin Hall Nano-Oscillator Empirical Electrical Model for Optimal On-chip Detector Design
Rafaella Fiorelli, Mona Rajabali, Roberto M\'endez-Romero, Akash Kumar, Artem Litvinenko, Teresa Serrano-Gotarredona, Farshad Moradi, Johan {\AA}kerman, Bernab\'e Linares-Barranco, Eduardo Peral\'ias
arXiv:2404.10334v1 Announce Type: new Abstract: As nascent nonlinear oscillators, nano-constriction spin Hall nano-oscillators (SHNOs) represent a promising potential for integration into more complicated systems such as neural networks, magnetic field sensors, and radio frequency (RF) signal classification, their tunable high-frequency operating regime, easy synchronization, and CMOS compatibility can streamline the process. To implement SHNOs in any of these networks, the electrical features of a single device are needed before designing the signal detection CMOS circuitry. This study centers on presenting an empirical electrical model of the SHNO based on a comprehensive characterization of the output impedance of a single SHNO, and its available output power in the range of 2-10 GHz at various bias currents.

Optical signatures of strain-induced ferromagnetism in LaCoO$_3$ thin film
F. Abadizaman, M. Kiaba, A. Dubroka
arXiv:2404.10385v1 Announce Type: new Abstract: Using spectroscopic ellipsometry, we studied the optical conductivity of LaCoO$_3$ with various degrees of strain. The optical response of the compressively strained \lco\ film is qualitatively similar to the one of the unstrained LaCoO$_3$ polycrystalline sample and exhibits redistribution of the spectral weight between about 0.2 and 6 eV, which is most likely related to the thermal excitation of the high-spin states. The optical response of the ferromagnetic tensile strained film exhibits clear signatures due to the ferromagnetic state. Below the Curie temperature $T_c=82$ K, the spectral weight is transferred with the increasing temperature from low energies between 0.2 and 3.3 eV to energies between 3.3 and 5.6 eV. The temperature dependence of the low-energy spectral weight between 0.2 and 3.3 eV can be understood in the framework of the high-spin biexciton model of Sotnikov and Kune\v{s} as corresponding to the variation of the concentration of high-spin states that are stabilized below $T_c$. The magnitude of redistribution of spectral weight due to the formation of the ferromagnetic state is sizable. We estimate that it corresponds to a lowering of the kinetic energy of 13 meV per Co ion, which is about two times $k_BT_c$. The latter shows that the saving of the kinetic energy is important and may be the leading energy contribution in the formation of the ferromagnetic phase.

Supercoiled ring polymers under shear flow
Christoph Schneck, Jan Smrek, Christos N. Likos, Andreas Z\"ottl
arXiv:2404.10414v1 Announce Type: new Abstract: We apply monomer-resolved computer simulations of supercoiled ring polymers under shear, taking full account of the hydrodynamic interactions, accompanied, in parallel, by simulations in which these are switched off. The combination of bending and torsional rigidities inherent in these polymers, in conjunction with hydrodynamics, has a profound impact on their flow properties. In contrast to their flexible counterparts, which dramatcially deform and inflate under shear [Liebetreu et al., Commun. Mater. 1, 4 (2020)], supercoiled rings undergo only weak changes in their overall shape and they display both a reduced propensity to tumbling (at fixed Weissenberg number) and a much stronger orientational resistance with respect to their flexible counterparts. In the presence of hydrodynamic interactions, the coupling of the polymer to solvent flow is capable of bringing about a topological transformation of writhe to twist at strong shear upon conservation of the overall linking number.

A stochastic discrete slip approach to microplasticity: Application to submicron W pillars
Carlos J. Ruestes, Javier Segurado
arXiv:2404.10430v1 Announce Type: new Abstract: A stochastic discrete slip approach is proposed to model plastic deformation in submicron domains. The model is applied to the study of submicron pillar ($D~\leq~1\mu m$) compression experiments on tungsten (W), a prototypical metal for applications under extreme conditions. Slip events are geometrically resolved in the specimen and considered as eigenstrain fields producing a displacement jump across a slip plane. This novel method includes several aspects of utmost importance to small-scale plasticity, i.e. source truncation effects, surface nucleation effects, starvation effects, slip localization and an inherently stochastic response. Implementation on an FFT-spectral solver results in an efficient computational 3-D framework. Simulations of submicron W pillars ($D~\leq~1\mu m$) under compression show that the method is capable of capturing salient features of sub-micron scale plasticity. These include the natural competition between pre-existing dislocations and surface nucleation of new dislocations. Our results predict distinctive flow stress power-law dependence exponents as well as a size-dependence of the strain-rate sensitivity exponent. The results are thoroughly compared with experimental literature.

Reconfigurable spin-wave platform based on interplay between nanodots and waveguide in hybrid magnonic crystal
Krzysztof Szulc, Mateusz Zelent, Maciej Krawczyk
arXiv:2404.10493v1 Announce Type: new Abstract: We present a hybrid magnonic crystal composed of a chain of nanodots with strong perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction, positioned above a permalloy waveguide. The study examines two different magnetization states in the nanodots: a single-domain state and an egg-shaped skyrmion state. Due to the dipolar coupling between the dot and the waveguide, a strongly bound hybrid magnetization texture is formed in the system. Our numerical results show complex spin-wave spectra, combining the effects of periodicity, magnetization texture, and hybridization of the propagating waves in the waveguide with the dot/skyrmion modes. The systems are characterized by different band gap sizes. For the skyrmion state, the azimuthal modes confined to the skyrmion domain wall lead to the formation of flat bands at low frequencies, while at higher frequencies we identify among them modes interacting with the propagating waves, which can introduce additional non-Bragg band gaps, as well as isolated modes leading to the formation of bound states. On the other hand, the system with a single-domain state in nanodots offers a wide range of frequencies where the spin waves are predominantly in the waveguide. Thus, the study shows that the proposed hybrid magnonic crystals have many distinct functionalities, highlighting their reconfigurable potential, magnon-magnon couplings, mode localization, and bound states overlapping with the propagating waves. This opens up potential applications in analog and quantum magnonics, spin-wave filtering, and the establishment of magnonic neural networks.

Anisotropic magnetic and quadrupolar H-T phase diagram of CeRh2As2
Burkhard Schmidt, Peter Thalmeier
arXiv:2404.10510v1 Announce Type: new Abstract: The tetragonal heavy fermion compound CeRh2As2 has intriguing low temperature symmetry breaking phases whose nature is unclear. The unconventional superconducting phase is complemented by other normal state phases which presumably involve ordering of 4f electron multipoles supported by the Kramers doublets split by the tetragonal CEF. The most striking aspect is the pronounced anisotropic H-T phase boundary for in- and out-of plane field direction. Using a localised 4f CEF model we demonstrate that its essential features can be understood as the result of competing low field easy-plane magnetic order and field-induced quadrupolar order of xy type. We present calculations based on coupled multipole RPA response function approach as well as molecular field treatment in the ordered regime. We use an analytical approach for a reduced quasi-quartet model and numerical calculations for the complete CEF level scheme. We discuss the quantum critical properties as function of multipolar control parameters and explain the origin of a pronounced a-c anisotropy of the H-T phase diagram. Finally the field and temperature evolution of multipolar order parameters is derived and the high field phase diagram is predicted.

Asymmetric dynamical charges in two-dimensional ferroelectrics
Daniel Bennett, Philippe Ghosez
arXiv:2404.10549v1 Announce Type: new Abstract: Ferroelectricity is commonly understood in terms of dynamical charges, which represent the dipole moments generated by atomic displacements or the forces induced by electric fields. In ferroelectrics with a high degree of symmetry, the dynamical charges are typically symmetric tensors, and can be visualized as ellipsoids. In van der Waals (vdW) materials which break centrosymmetry, a new type of ferroelectricity arises which differs greatly from conventional ferroelectrics. The polarization is purely electronic, arising from an interlayer charge transfer, and most of the polarization generated is perpendicular to atomic motion. We show that the unconventional properties of vdW ferroelectrics are manifested in their dynamical charges, which exhibit spatial modulation and intrinsic asymmetry. Dynamical charges in vdW ferroelectrics, and more generally, any strongly anisotropic ferroelectric, can be visualized as deformable, non-ideal ellipsoids dependent on the atomic configuration. Furthermore, we show that, due to the mixed electrostatic boundary conditions employed for two-dimensional materials, non-diagonal dynamical charges in 2D materials are always asymmetric.

Strain-dependent one-dimensional confinement channels in twisted bilayer 1T$'$-WTe$_2$
Samuel J. Magorrian, Nicholas D. M. Hine
arXiv:2404.10557v1 Announce Type: new Abstract: The low symmetry and anistropic lattice of 1T$'$ WTe$_2$ is responsible for the existence of parallel one-dimensional channels in the moir\'e patterns of twisted bilayers. This gives the opportunity to explore moir\'e physics of a different nature to that widely observed in twisted bilayers of materials with hexagonal symmetries. Here, we combine plane-wave and linear-scaling density functional theory calculations to describe the electronic properties of twisted bilayer 1T$'$ WTe$_2$. For a small change in the lattice parameters of the constituent 1T$'$ WTe$_2$ monolayers, we find a substantial moir\'e-induced striped electrostatic potential landscape in the twisted bilayer, with a peak-to-trough magnitude $>$200~meV.

Electronic Properties of Electroactive Ferrocenyl-Functionalized MoS2
Trung Nghia Nguy\^en L\^e, Kirill Kondratenko, Imane Arbouch, Alain Mor\'eac, d Jean-Christophe Le Breton, Colin van Dyck, J\'er\^ome Cornil, Dominique Vuillaume, Bruno Fabre
arXiv:2404.10565v1 Announce Type: new Abstract: The attachment of redox active molecules to transition metal dichalcogenides (TMDs), such as MoS2, constitutes a promising approach for designing electrochemically switchable devices through the control of the material charge/spin transport properties by the redox state of the grafted molecule and thus the applied electrical potential. In this work, defective plasma treated MoS2 is functionalized by a ferrocene derivative and thoroughly investigated by various characterization techniques, such as Raman, photoluminescence, X-ray photoelectron spectroscopies, atomic force microscopy (AFM) and electrochemistry. Furthermore, in-plane and out-of-plane conductive-AFM measurements (I-V and first derivative dI/dV-V curves) are measured to investigate the effect of the chemical functionalization of MoS2 on the electron transport properties. While the conduction and valence bands are determined at +0.7 and -1.2 eV with respect of the electrode Fermi energy for pristineMoS2, additional states in an energy range of ca. 0.45 eV below the MoS2 conduction band are measured after plasma treatment, attributed to S-vacancies. For ferrocene functionalized MoS2, the S-vacancy states are no longer observed resulting from the defect healing. However, two bumps at lower voltages in the dI/dV-V indicate a contribution to the electron transport through ferrocene HOMO, which is located in the MoS2 band gap at ca. 0.4-0.6 eV below the Fermi energy. These results are in good agreement with theoretical density functional theory (DFT) calculations and UV photoelectron spectroscopy (UPS) measurements.

Quantum phase transition and critical behavior between the gapless topological phases
Hao-Long Zhang, Han-Ze Li, Sheng Yang, Xue-Jia Yu
arXiv:2404.10576v1 Announce Type: new Abstract: The phase transition between gapped topological phases represents a class of unconventional criticality beyond the Landau paradigm. However, recent research has shifted attention to topological phases without a bulk gap, where the phase transitions between them are still elusive. In this work, based on large-scale density matrix renormalization group techniques, we investigate the critical behaviors of the extended quantum XXZ model obtained by the Kennedy-Tasaki transformation. Using fidelity susceptibility as a diagnostic, we obtain a complete phase diagram, which includes both topological nontrivial and trivial gapless phases. Furthermore, as the XXZ-type anisotropy parameter $\Delta$ varies, both the critical points $h_c$ and correlation length exponent $\nu$ remain the same as in the $\Delta=0$ case, characterized by $c=3/2$ (Ising + free boson) conformal field theory. Our results indicate that fidelity susceptibility can effectively detect and reveal a stable unconventional critical line between the topologically distinct gapless phases for general $\Delta$. This work serves as a valuable reference for further research on phase transitions within the gapless topological phase of matter.

Anomaly of Subsystem Symmetries in Exotic and Foliated $BF$ Theories
Shutaro Shimamura
arXiv:2404.10601v1 Announce Type: new Abstract: We study the mixed 't Hooft anomaly of the subsystem symmetries in the exotic $BF$ theory and the foliated $BF$ theory in 2+1 dimensions, both of which are fractonic quantum field theories describing the equivalent physics. In the anomaly inflow mechanism, the 't Hooft anomaly of the subsystem symmetries can be cancelled by combining a subsystem symmetry-protected topological (SSPT) phase in one dimension higher. In this work, we construct the exotic and foliated $BF$ theories with background gauge fields and the exotic and foliated forms of the SSPT phases using the foliated-exotic duality. In the foliated form, we see that the non-topological operator can be viewed as a symmetry-like operator. We also show that the SSPT phases with different foliation structures cancel the same anomaly. This may provide a clue to the characterization of the 't Hooft anomaly of subsystem symmetries.

Phase diagram of the quantum spin-1/2 Heisenberg-$\Gamma$ model on a frustrated zigzag chain
Hidehiro Saito, Chisa Hotta
arXiv:2404.10615v1 Announce Type: new Abstract: We investigate the quantum spin-1/2 zigzag chain with frustrated $J_1$-$J_2$ Heisenberg interactions, incorporating additional off-diagonal exchange interactions known as the $\Gamma$-term, both with and without an applied magnetic field. Based on the density-matrix renormalization group calculation, we map out the ground state phase diagram that shows a variety of magnetic and nonmagnetic phases including multicritical points and several exactly solvable points. Upon introducing a finite $\Gamma$-term, we observe the persistent dimer singlet state of the $J_1$-$J_2$ Heisenberg model, sustaining a nonzero spin gap, while also giving rise to a new gapless branch of nonmagnetic excitation. This gapless mode induces robust nematic fluctuations manifesting in its long-ranged correlations, however, the true condensation does not occur until the $\Gamma$-term becomes comparable with the Heisenberg term. There, the nonmagnetic phases transform into Ising-type ferromagnetic or antiferromagnetic long-range orders that arise from the $\Gamma$-term spontaneously selecting magnetic easy axes. Its orientations dictate the type of magnetic order under geometric frustration effects as predicted by Landau's mean-field theory. These theoretical findings provide insights into the exotic low-temperature phase observed in YbCuS$_2$, characterized by gapless excitations and seemingly nonmagnetic behavior accompanied by incommensurate correlations.

Modulating Hamiltonian Approach to Quantum Many-Body Systems and Crystalline Topological Phases Protected by Generalized Magnetic Translations
Yuan Yao, Akira Furusaki
arXiv:2404.10621v1 Announce Type: new Abstract: We discuss the topology of the parameter space of invertible phases with an onsite symmetry $G$, i.e., quantum many-body ground states that have neither fractionalization nor spontaneous breaking of the symmetry. The classification of invertible phases is known to be obtained by counting the connected components in the parameter space of the invertible phases. We consider its generalization -- the deformation classes of the mappings from $n$-dimensional spheres $S^n$ to this parameter space for arbitrary integer $n$. We argue a direct one-to-one correspondence in the framework of lattice models between the non-contractibility of $S^n$ and (i) the classification of invertible phases in $d$ dimensions when $d\geq n$; or (ii) zero-dimensional invertible Hamiltonians parametrized by $S^{n-d}$ when $d

Arsenic diffusion in MOVPE-Grown GaAs/Ge epitaxial structures
V. Orejuela, E. Garcia-Tabares, I. Rey-Stolle, I. Garcia
arXiv:2404.10669v1 Announce Type: new Abstract: Germanium is reemerging as a prominent material in the semiconductor field, particularly for electronic applications, photonics, photovoltaics and thermophotovoltaics. Its combination with III-V compound semiconductors through epitaxial growth by metal organic vapor phase epitaxy (MOVPE) is instrumental and thus, the comprehension of the sequential stages in such epitaxial processes is of great importance. During the deposition of GaAs on p-type Ge, the formation of n/p junctions occurs when As diffuses into Ge. It is found that this formation begins in the so-called AsH3 preexposure where Ge substrate is firstly exposed to AsH3. Also important is the fact that both free carrier profiles and As profiles indicate that prolonged AsH3 preexposure times lead to deeper diffusion depths for the same process time. This effect is concomitant with the degradation of the Ge surface morphology, characterized by higher roughness as the AsH3 preexposure duration is extended. Contrary to ion-implanted As in germanium, which shows quadratic dependent diffusivity, our MOVPE investigation using AsH3 indicates a linear relationship, consistent with Takenaka et al.'s MOVPE study using TBAs. Analyzing As profiles alongside simulations, with and without subsequent GaAs epitaxy, suggests the generation of Ge vacancies during the process, contributing to deeper As diffusion.

Haldane graphene billiards versus relativistic neutrino billiards
Dung Xuan Nguyen, Barbara Dietz
arXiv:2404.07679v1 Announce Type: cross Abstract: We study fluctuation properties in the energy spectra of finite-size honeycomb lattices, graphene billiards, subject to the Haldane-model onsite potential and next-nearest neighbor interaction at critical points, referred to as Haldane graphene billiards in the following. The billiards had the shapes of a rectangular billiard with integrable dynamics, one with chaotic dynamics, and one whose shape has, in addition, threefold rotational symmetry. It had been shown that the spectral properties of the graphene billiards coincide with those of the nonrelativistic quantum billiard with the corresponding shape, both at the band edges and in the region of low energy excitations around the Dirac points at zero energy. There, the dispersion relation is linear and, accordingly, the spectrum is described by the same relativistic Dirac equation for massless half-spin particles as relativistic neutrino billiards, whose spectral properties agree with those of nonrelativistic quantum billiards with violated time-reversal invariance. Deviations from the expected behavior are attributed to differing boundary conditions and backscattering at the boundary, which leads to a mixing of valley states corresponding to the two Dirac points, that are mapped into each other through time reversal. We employ a Haldane model to introduce a gap at one of the two Dirac points so that backscattering is suppressed in the energy region of the gap and demonstrate that there the correlations in the spectra comply with those of the neutrino billiard of the corresponding shape.

Grover's algorithm in a four-qubit silicon processor above the fault-tolerant threshold
Ian Thorvaldson, Dean Poulos, Christian M. Moehle, Saiful H. Misha, Hermann Edlbauer, Jonathan Reiner, Helen Geng, Benoit Voisin, Michael T. Jones, Matthew B. Donnelly, Luis F. Pena, Charles D. Hill, Casey R. Myers, Joris G. Keizer, Yousun Chung, Samuel K. Gorman, Ludwik Kranz, Michelle Y. Simmons
arXiv:2404.08741v1 Announce Type: cross Abstract: Spin qubits in silicon are strong contenders for realizing a practical quantum computer. This technology has made remarkable progress with the demonstration of single and two-qubit gates above the fault-tolerant threshold and entanglement of up to three qubits. However, maintaining high fidelity operations while executing multi-qubit algorithms has remained elusive, only being achieved for two spin qubits to date due to the small qubit size, which makes it difficult to control qubits without creating crosstalk errors. Here, we use a four-qubit silicon processor with every operation above the fault tolerant limit and demonstrate Grover's algorithm with a ~95% probability of finding the marked state, one of the most successful implementations to date. Our four-qubit processor is made of three phosphorus atoms and one electron spin precision-patterned into 1.5 nm${}^2$ isotopically pure silicon. The strong resulting confinement potential, without additional confinement gates that can increase cross-talk, leverages the benefits of having both electron and phosphorus nuclear spins. Significantly, the all-to-all connectivity of the nuclear spins provided by the hyperfine interaction not only allows for efficient multi-qubit operations, but also provides individual qubit addressability. Together with the long coherence times of the nuclear and electron spins, this results in all four single qubit fidelities above 99.9% and controlled-Z gates between all pairs of nuclear spins above 99% fidelity. The high control fidelities, combined with >99% fidelity readout of all nuclear spins, allows for the creation of a three-qubit Greenberger-Horne-Zeilinger (GHZ) state with 96.2% fidelity, the highest reported for semiconductor spin qubits so far. Such nuclear spin registers can be coupled via electron exchange, establishing a path for larger scale fault-tolerant quantum processors.

Landau-Zener without a Qubit: Unveiling Multiphoton Interference, Synthetic Floquet Dimensions, and Dissipative Quantum Chaos
Leo Peyruchat, Fabrizio Minganti, Marco Scigliuzzo, Filippo Ferrari, Vincent Jouanny, Franco Nori, Vincenzo Savona, Pasquale Scarlino
arXiv:2404.10051v1 Announce Type: cross Abstract: Landau-Zener-St\"uckelberg-Majorana (LZSM) interference emerges when the parameters of a $\textit{qubit}$ are periodically modulated across an avoided level crossing. Here, we investigate the occurrence of the LZSM phenomenon in nonlinear multilevel bosonic systems, where the interference pattern is determined by multiple energy levels and cannot be described by a level crossing between only two states. We fabricate two superconducting resonators made of flux-tunable Josephson junction arrays. The first device is very weakly nonlinear (the nonlinearity is smaller than the photon-loss rate) and, when a weak driving field is applied, it behaves as a linear resonator, yet shows the same LZSM interference as in a two-level system. Notably, here the interference originates from multiple avoided level crossings of the harmonic ladder. When subjected to a stronger drive, nonlinear effects start playing a role, and the interference pattern departs from the one observed in two-level systems. We demonstrate that, when two or more LZSM interference peaks merge, dissipative quantum chaos emerges. In the second device, where the nonlinearity surpasses the photon-loss rate, we observe additional LZSM interference peaks due to Kerr multiphoton resonances. When described under the light of the Floquet theory, these resonances can be interpreted as synthetic modes of an array of coupled cavities. We derive a simple effective model highlighting the essential features of the entirety of these phenomena. As the control of LZSM in qubit systems led to the implementation of fast protocols for characterization and state preparation, our findings pave the way to better control of nonlinear resonators, with implications for diverse quantum technological platforms.

A strongly interacting, two-dimensional, dipolar spin ensemble in (111)-oriented diamond
Lillian B. Hughes, Simon A. Meynell, Weijie Wu, Shreyas Parthasarathy, Lingjie Chen, Zhiran Zhang, Zilin Wang, Emily J. Davis, Kunal Mukherjee, Norman Y. Yao, Ania C. Bleszynski Jayich
arXiv:2404.10075v1 Announce Type: cross Abstract: Systems of spins with strong dipolar interactions and controlled dimensionality enable new explorations in quantum sensing and simulation. In this work, we investigate the creation of strong dipolar interactions in a two-dimensional ensemble of nitrogen-vacancy (NV) centers generated via plasma-enhanced chemical vapor deposition (PECVD) on (111)-oriented diamond substrates. We find that diamond growth on the (111) plane yields high incorporation of spins, both nitrogen and NV centers, where the density of the latter is tunable via the miscut of the diamond substrate. Our process allows us to form dense, preferentially aligned, 2D NV ensembles with volume-normalized AC sensitivity down to $\eta_{AC}$ = 810 pT um$^{3/2}$ Hz$^{-1/2}$. Furthermore, we show that (111) affords maximally positive dipolar interactions amongst a 2D NV ensemble, which is crucial for leveraging dipolar-driven entanglement schemes and exploring new interacting spin physics.

Onsager's "Ideal Turbulence" Theory
Gregory Eyink
arXiv:2404.10084v1 Announce Type: cross Abstract: Lars Onsager in 1945-1949 made an exact analysis of the high Reynolds-number limit for individual turbulent flow realizations modeled by incompressible Navier-Stokes equations, motivated by experimental observations that dissipation of kinetic energy does not vanish. I review here developments spurred by his key idea, that such flows are well-described by distributional or "weak" solutions of ideal Euler equations. 1/3 H\"older singularities of the velocity field were predicted by Onsager and since observed. His theory describes turbulent energy cascade without probabilistic assumptions and yields a local, deterministic version of the Kolmogorov 4/5th law. The approach is closely related to renormalization group methods in physics and envisages "conservation-law anomalies", as discovered later in quantum field theory. There are also deep connections with Large-Eddy Simulation modeling. More recently, dissipative Euler solutions of the type conjectured by Onsager have been constructed and his 1/3 H\"older singularity proved to be the sharp threshold for anomalous dissipation. This progress has been achieved by an unexpected connection with work of John Nash on isometric embeddings of low regularity or "convex integration" techniques. The dissipative Euler solutions yielded by this method are wildly non-unique for fixed initial data, suggesting "spontaneously stochastic" behavior of high-Reynolds number solutions. I focus in particular on applications to wall-bounded turbulence, leading to novel concepts of spatial cascades of momentum, energy and vorticity to or from the wall as deterministic, space-time local phenomena. This theory thus makes testable predictions and offers new perspectives on Large-Eddy Simulation in presence of solid walls.

Classification of the Mott gap
Debabrata Ghorai, Taewon Yuk, Young-Kwon Han, Sang-Jin Sin
arXiv:2404.10412v1 Announce Type: cross Abstract: In this paper, we demonstrate the classification of the gap in a holographic setup by studying the density of states. A gap can be classified into order gap and Mott gap depending on the presence of the order due to the symmetry breaking or not. A Mott insulating gap appears in the fermion spectrum due to the strong Coulomb interaction between the electrons. We then classify all Mott gaps as well as order gaps in one-flavor and two-flavor fermions. We also identified possible non-minimal interactions that may produce a flatband.

Observation of thermal microwave photons with a Josephson junction detector
A. L. Pankratov, A. V. Gordeeva, A. V. Chiginev, L. S. Revin, A. V. Blagodatkin, N. Crescini, L. S. Kuzmin
arXiv:2404.10434v1 Announce Type: cross Abstract: When measuring electromagnetic radiation of frequency $f$, the most sensitive detector is the one that counts the single quanta of energy $h f$. Single photon detectors (SPDs) were demonstrated from $\gamma$-rays to infrared wavelengths, and extending this range down to the microwaves is the focus of intense research. The energy of $10\,\mathrm{GHz}$ microwave photon, about $40\,\mathrm{\mu eV}$ or $7\, \mathrm{yJ},$ is enough to force a superconducting Josephson junction into its resistive state, making it suitable to be used as a sensor. In this work, we use an underdamped Josephson junction to detect single thermal photons stochastically emitted by a microwave copper cavity at millikelvin temperatures. After characterizing the source and detector, we vary the temperature of the resonant cavity and measure the increased photon rate. The device shows an efficiency up to 40% and a dark count rate of $0.1\,\mathrm{Hz}$ in a bandwidth of several gigahertz. To confirm the thermal nature of the emitted photons we verify their super-Poissonian statistics, which is also a signature of quantum chaos. We discuss detector application in the scope of Dark Matter Axion searches, and note its importance for quantum information, metrology and fundamental physics.

Three-dimensional $\mathcal{P}\mathcal{T}$-symmetric topological phases with Pontryagin index
Zory Davoyan, Wojciech J. Jankowski, Adrien Bouhon, Robert-Jan Slager
arXiv:2308.15555v2 Announce Type: replace Abstract: We report on a certain class of three-dimensional topological insulators and semimetals protected by spinless $\mathcal{P}\mathcal{T}$ symmetry, hosting an integer-valued bulk invariant. We show using homotopy arguments that these phases host multi-gap topology, providing a realization of a single $\mathbb{Z}$ invariant in three spatial dimensions that is distinct from the Hopf index. We identify this invariant with the Pontryagin index, which describes BPST instantons in particle physics contexts and corresponds to a 3-sphere winding number. We study naturally arising multi-gap linked nodal rings, topologically characterized by split-biquaternion charges, which can be removed by non-Abelian braiding of nodal rings, even without closing a gap. We additionally connect the describing winding number in terms of gauge-invariant combinations of non-Abelian Berry connection elements, indicating relations to Pontryagin characteristic class in four dimensions. These topological configurations are furthermore related to fully non-degenerate multi-gap phases that are characterized by a pair of winding numbers relating to two isoclinic rotations in the case of four bands and can be generalized to an arbitrary number of bands. From a physical perspective, we also analyze the edge states corresponding to this Pontryagin index as well as their dissolution subject to the gap-closing disorder. Finally, we elaborate on the realization of these novel non-Abelian phases, their edge states and linked nodal structures in acoustic metamaterials and trapped-ion experiments.

Frustrated extended Bose-Hubbard model and deconfined quantum critical points with optical lattices at the anti-magic wavelength
Niccol\`o Baldelli, Cesar R. Cabrera, Sergi Juli\`a-Farr\'e, Monika Aidelsburger, Luca Barbiero
arXiv:2309.03193v2 Announce Type: replace Abstract: The study of geometrically frustrated many-body quantum systems is of central importance to uncover novel quantum mechanical effects. We design a scheme where ultracold bosons trapped in a one-dimensional state-dependent optical lattice are modeled by a frustrated Bose-Hubbard Hamiltonian. A derivation of the Hamiltonian parameters based on Cesium atoms, further show large tunability of contact and nearest-neighbour interactions. For pure contact repulsion, we discover the presence of two phases peculiar to frustrated quantum magnets: the bond-order-wave insulator with broken inversion symmetry and a chiral superfluid. When the nearest-neighbour repulsion becomes sizeable, a further density-wave insulator with broken translational symmetry can appear. We show that the phase transition between the two spontaneously-symmetry-broken phases is continuous, thus representing a one-dimensional deconfined quantum critical point not captured by the Landau-Ginzburg-Wilson symmetry-breaking paradigm. Our results provide a solid ground to unveil the novel quantum physics induced by the interplay of non-local interactions, geometrical frustration, and quantum fluctuations.

Lateral Solid Phase Epitaxy of Yttrium Iron Garnet
Sebastian Sailler, Darius Pohl, Heike Schl\"orb, Bernd Rellinghaus, Andy Thomas, Sebastian T. B. Goennenwein, Michaela Lammel
arXiv:2309.12002v2 Announce Type: replace Abstract: Solid phase epitaxy is a crystallization technique used to produce high quality thin films. Lateral solid phase epitaxy furthermore enables the realization of non-planar structures, which are interesting, e.g., in the field of spintronics. Here, we demonstrate lateral solid phase epitaxy of yttrium iron garnet over an artificial edge, such that the crystallization direction is perpendicular to the initial seed. We use single crystalline garnet seed substrates partially covered by a SiOx film to study the lateral crystallization over the SiOx mesa. The yttrium iron garnet layer retains the crystal orientation of the substrate not only when in direct contact with the substrate, but also across the edge on top of the SiOx mesa. By controlling the crystallization dynamics it is possible to almost completely suppress the formation of polycrystals and to enable epitaxial growth of single crystalline yttrium iron garnet on top of mesas made from arbitrary materials. From a series of annealing experiments, we extract an activation energy of 3.0 eV and a velocity prefactor of $6.5 \times 10^{14}$ nm/s for the lateral epitaxial crystallization along the <100> direction. Our results pave the way to engineer single crystalline non-planar yttrium iron garnet structures with controlled crystal orientation.

Stability of fractional Chern insulators with a non-Landau level continuum limit
Bartholomew Andrews, Mathi Raja, Nimit Mishra, Michael P. Zaletel, Rahul Roy
arXiv:2310.05758v2 Announce Type: replace Abstract: The stability of fractional Chern insulators is widely believed to be predicted by the resemblance of their single-particle spectra to Landau levels. We investigate the scope of this geometric stability hypothesis by analyzing the stability of a set of fractional Chern insulators that explicitly do not have a Landau level continuum limit. By computing the many-body spectra of Laughlin states in a generalized Hofstadter model, we analyze the relationship between single-particle metrics, such as trace inequality saturation, and many-body metrics, such as the magnitude of the many-body and entanglement gaps. We show numerically that the geometric stability hypothesis holds for Chern bands that are not continuously connected to Landau levels, as well as conventional Chern bands, albeit often requiring larger system sizes to converge for these configurations.

Twisted bilayer graphene revisited: minimal two-band model for low-energy bands
Daniel Bennett, Daniel T. Larson, Louis Sharma, Stephen Carr, Efthimios Kaxiras
arXiv:2310.12308v2 Announce Type: replace Abstract: An accurate description of the low-energy electronic bands in twisted bilayer graphene (tBLG) is of great interest due to their relation to correlated electron phases, such as superconductivity and Mott-insulator behavior at half-filling. The paradigmatic model of Bistritzer and MacDonald [PNAS 108, 12233 (2011)], based on the moir\'e pattern formed by tBLG, predicts the existence of "magic angles" at which the Fermi velocity of the low-energy bands goes to zero, and the bands themselves become dispersionless. Here, we reexamine the low-energy bands of tBLG from the ab initio electronic structure perspective, motivated by features related to the atomic relaxation in the moir\'e pattern, namely circular regions of AA stacking, triangular regions of AB/BA stacking and domain walls separating the latter. We find that the bands are never perfectly flat and the Fermi velocity never vanishes, but rather a "magic range" exists where the lower band becomes extremely flat and the Fermi velocity attains a non-zero minimum value. We propose a simple $(2+2)$-band model, comprised of two different pairs of orbitals, both on a honeycomb lattice: the first pair represents the low-energy bands with high localization at the AA sites, while the second pair represents highly dispersive bands associated with domain-wall states. This model gives an accurate description of the low-energy bands with few (13) parameters which are physically motivated and vary smoothly in the magic range. In addition, we derive an effective two-band hamiltonian which also gives an accurate description of the low-energy bands. This minimal two-band model affords a connection to a Hubbard-like description of the occupancy of sub-bands and can be used a basis for exploring correlated states.

Ultra-low glassy thermal conductivity and controllable, promising thermoelectric properties in crystalline o-CsCu5S3
Jincheng Yue, Jiongzhi Zheng, Junda Li, Siqi Guo, Wenling Ren, Han Liu, Yanhui Liu, Tian Cui
arXiv:2401.16527v2 Announce Type: replace Abstract: We thoroughly investigate the microscopic mechanisms of the thermal transport in orthorhombic \textit{o}-CsCu$_5$S$_3$ by integrating the first-principles-based self-consistent phonon calculations (SCP) with the linearized Wigner transport equation (LWTE). Our methodology takes into account contributions to phonon energy shifts and phonon scattering rates from both three- and four-phonon processes. Additionally, it incorporates the off-diagonal terms of heat flux operators to calculate the total thermal conductivity. The predicted $\kappa_\mathrm{L}$ with an extremely weak temperature dependence following $\sim T^{-0.33}$, in good agreement with experimental values along with the parallel to the Bridgman growth direction. Such nonstandard temperature dependence of $\kappa_\mathrm{L}$ can be traced back to the dual particlelike-wavelike behavior exhibited by thermal phonons. Specifically, the coexistence of the stochastic oscillation of Cs atoms and metavalent bonding among interlayer Cu-S atoms limits the particle-like phonon propagation and enhances the wave-like tunneling of phonons. Simultaneously, the electrical transport properties are determined by employing a precise momentum relaxation-time approximation (MRTA) within the framework of the linearized Boltzmann transport equation (LBTE). By properly adjusting the carrier concentration, excellent thermoelectric performance is achieved, with a maximum thermoelectric conversion efficiency of 18.4$\%$ observed at 800 K in \textit{p}-type \textit{o}-CsCu$_5$S$_3$.} Our work not only elucidates the anomalous thermal transport behavior in the copper-based chalcogenide \textit{o}-CsCu$_5$S$_3$ but also provides insights for manipulating its thermal and electronic properties for potential thermoelectric applications.

Realization of Wess-Zumino-Witten transitions with levels $k=6$ and $k=4$ in a frustrated spin-3 chain
Natalia Chepiga
arXiv:2402.05031v2 Announce Type: replace Abstract: We study dimerization transitions in a frustrated spin-3 chain with next-nearest neighbor and three-site interactions. We show that two independent coupling constants of the model are sufficient to fine-tune the system to the critical point in the Wess-Zumino-Witten SU(2)$_6$ universality class. This critical point appears as the end point of an extended SU(2)$_4$ critical line. This implies that the renormalization group flow lead to the critical theory with the largest level $k$ such that the number of relevant operators is reduced by one and the parity of the level is preserved. Furthermore, we argue that due to the presence of marginal operator there is only one point in the SU(2)$_6$ universality class. In addition, we report the appearance of non-magnetic Ising transition between the topologically trivial uniform and dimerized phases. This transition takes place within the singlet sector, while magnetic gap remains open.

Are boron-nitride nanobelts capable to capture greenhouse gases?
C. Aguiar, I. Camps
arXiv:2402.13102v2 Announce Type: replace Abstract: Why is the question in the title pertinent? Toxic gases, which are detrimental to both human health and the environment, have been released in greater quantities as a result of industrial development. These gases necessitate capture, immobilization, and measurement. Consequently, the present study investigates the interactions between boron-nitride nanobelt and M\"obius-type boron-nitride nanobelt and nine greenhouse gases, namely ammonia, carbon dioxide, carbon monoxide, hydrogen sulfide, methane, methanol, nitric dioxide, nitric oxide, and phosgene. The adsorption energies calculated for the structures with optimized geometry are all negative, suggesting that all gases are adsorbed favorably in both nanobelts. Furthermore, we discovered that the recovery time of the sensors ranges from two hours to a few nanoseconds, and that the nanobelts exhibit distinct responses to each gas. According to electronic and topological investigations, covalent bonds were exclusively formed by nitric oxide; the remaining gases formed non-covalent bonds. Molecular dynamics ultimately demonstrate that the interaction between a single gas molecule and the nanobelt remains consistent across the vast majority of gases, whereas the interaction between 500 gas molecules and the nanobelts functions as an attraction, notwithstanding the impact of volumetric effects characteristic of high volume gases on the interaction. For the completion of each calculation, semiempirical tight-binding methods were implemented utilizing the xTB software. The outcomes of our study generated a favorable response to the inquiry posed in the title.

Spin-polarized Specular Andreev Reflections in Altermagnets
Yutaro Nagae, Andreas P. Schnyder, Satoshi Ikegaya
arXiv:2403.07117v2 Announce Type: replace Abstract: We propose a multi-terminal device consisting of an $s$-wave superconductor coupled to an altermagnet, to generate highly correlated spin currents via Cooper pair splitting. Remarkably, we find that the correlated spin currents are induced by specular Andreev reflections in the altermagnet, an effect that has up to now been predicted to occur only in a very limited number of systems, e.g., Dirac/Weyl materials coupled to superconductors. We demonstrate that positive non-local charge currents and positive noise cross-correlations are unambiguous fingerprints of the specular Andreev reflections in our proposed device.

Ultrafast exciton transport in van der Waals heterostructures
M. M. Glazov, R. A. Suris
arXiv:2403.19571v2 Announce Type: replace Abstract: Excitons in van der Waals heterostructures based on atomically thin transition metal dichalcogenides are considered as potential candidates for the formation of a superfluid state in two-dimensional systems. A number of studies reported observations of ultrafast nondiffusive propagation of excitons in van der Waals heterostructures, which was considered by their authors as possible evidence of collective effects in excitonic systems. In this paper, after a brief analysis of exciton propagation regimes in two-dimensional semiconductors, an alternative model of ultrafast exciton transport is proposed, based on the formation of waveguide modes in van der Waals heterostructures and the radiation transfer by these modes.

Bloch-Landau-Zener oscillations in a quasi-periodic potential
Henrique C. Prates, Vladimir V. Konotop
arXiv:2404.00642v2 Announce Type: replace Abstract: Bloch oscillations and Landau-Zener tunneling are ubiquitous phenomena which are sustained by a band-gap spectrum of a periodic Hamiltonian and can be observed in dynamics of a quantum particle or a wavepacket in a periodic potential under action of a linear force. Such physical setting remains meaningful for aperiodic potentials too, although band-gap structure does not exist anymore. Here we consider the dynamics of noninteracting atoms and Bose-Einstein condensates in a quasi-periodic one-dimensional optical lattice subjected to a weak linear force. Excited states with energies below the mobility edge, and thus localized in space, are considered. We show that the observed oscillatory behavior is enabled by tunneling between the initial state and a state (or several states) located nearby in the coordinate-energy space. The states involved in such Bloch-Landau-Zener oscillations are determined by the selection rule consisting of the condition of their spatial proximity and condition of quasi-resonances occurring at avoided crossings of the energy levels. The latter condition is formulated mathematically using the Gershgorin circle theorem. The effect of the inter-atomic interactions on the dynamics can also be predicted on the bases of the developed theory. The reported results can be observed in any physical system allowing for observation of the Bloch oscillations, upon introducing incommensurablity in the governing Hamiltonian.

Stability and noncentered PT symmetry of real topological phases
S. J. Yue, Qing Liu, Shengyuan A. Yang, Y. X. Zhao
arXiv:2404.08215v2 Announce Type: replace Abstract: Real topological phases protected by the spacetime inversion (P T) symmetry are a current research focus. The basis is that the P T symmetry endows a real structure in momentum space, which leads to Z2 topological classifications in 1D and 2D. Here, we provide solutions to two outstanding problems in the diagnosis of real topology. First, based on the stable equivalence in K-theory, we clarify that the 2D topological invariant remains well defined in the presence of nontrivial 1D invariant, and we develop a general numerical approach for its evaluation, which was hitherto unavailable. Second, under the unit-cell convention, noncentered P T symmetries assume momentum dependence, which violates the presumption in previous methods for computing the topological invariants. We clarify the classifications for this case and formulate the invariants by introducing a twisted Wilson-loop operator for both 1D and 2D. A simple model on a rectangular lattice is constructed to demonstrate our theory, which can be readily realized using artificial crystals.

A SymTFT for Continuous Symmetries
T. Daniel Brennan, Zhengdi Sun
arXiv:2401.06128v2 Announce Type: replace-cross Abstract: Symmetry is a powerful tool for studying dynamics in QFT: it provides selection rules, constrains RG flows, and often simplifies analysis. Currently, our understanding is that the most general form of symmetry is described by categorical symmetries which can be realized via Symmetry TQFTs or ``SymTFTs." In this paper, we show how the framework of the SymTFT, which is understood for discrete symmetries (i.e. finite categorical symmetries), can be generalized to continuous symmetries. In addition to demonstrating how $U(1)$ global symmetries can be incorporated into the paradigm of the SymTFT, we apply our formalism to study cubic $U(1)$ anomalies in $4d$ QFTs, describe the $\mathbb{Q}/\mathbb{Z}$ non-invertible chiral symmetry in $4d$ theories, and conjecture the SymTFT for general continuous $G^{(0)}$ global symmetries.

Unveiling interatomic distances influencing the reaction coordinates in alanine dipeptide isomerization: An explainable deep learning approach
Kazushi Okada, Takuma Kikutsuji, Kei-ichi Okazaki, Toshifumi Mori, Kang Kim, Nobuyuki Matubayasi
arXiv:2402.08448v2 Announce Type: replace-cross Abstract: The present work shows that the free energy landscape associated with alanine dipeptide isomerization can be effectively represented by specific interatomic distances without explicit reference to dihedral angles. Conventionally, two stable states of alanine dipeptide in vacuum, i.e., C$7_{\mathrm{eq}}$ ($\beta$-sheet structure) and C$7_{\mathrm{ax}}$ (left handed $\alpha$-helix structure), have been primarily characterized using the main chain dihedral angles, $\varphi$ (C-N-C$_\alpha$-C) and $\psi$ (N-C$_\alpha$-C-N). However, our recent deep learning combined with "Explainable AI" (XAI) framework has shown that the transition state can be adequately captured by a free energy landscape using $\varphi$ and $\theta$ (O-C-N-C$_\alpha$) [T. Kikutsuji, et al. J. Chem. Phys. 156, 154108 (2022)]. In perspective of extending these insights to other collective variables, a more detailed characterization of transition state is required. In this work, we employ the interatomic distances and bond angles as input variables for deep learning, rather than the conventional and more elaborate dihedral angles. Our approach utilizes deep learning to investigate whether changes in the main chain dihedral angle can be expressed in terms of interatomic distances and bond angles. Furthermore, by incorporating XAI into our predictive analysis, we quantified the importance of each input variable and succeeded in clarifying the specific interatomic distance that affects the transition state. The results indicate that constructing a free energy landscape based on using the identified interatomic distance can clearly distinguish between the two stable states and provide a comprehensive explanation for the energy barrier crossing.

Found 12 papers in prb
Date of feed: Wed, 17 Apr 2024 03:16:56 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Fragility of the magnetic order in the prototypical altermagnet ${\mathrm{RuO}}_{2}$
Andriy Smolyanyuk, Igor I. Mazin, Laura Garcia-Gassull, and Roser Valentí
Author(s): Andriy Smolyanyuk, Igor I. Mazin, Laura Garcia-Gassull, and Roser Valentí

Altermagnetism is increasingly gaining attention and RuO2 thin films have been arguably the most popular altermagnetic candidate. However, most publications miss a disturbing fact: direct experiments indicate the absence of any sizable ordered magnetism in stoichiometric bulk samples. Here, the authors confirm, through first-principles calculations, that the bulk samples are indeed far from ordered magnetism, but intrinsic hole doping strongly enhances the tendency to magnetism, suggesting an interesting possibility that the measured thin films may be magnetically different from stoichiometric bulk RuO2.


[Phys. Rev. B 109, 134424] Published Tue Apr 16, 2024

Antiferromagnetic ordering and chiral crystal structure transformation in ${\mathrm{Nd}}_{3}{\mathrm{Rh}}_{4}{\mathrm{Sn}}_{13}$
Ami Shimoda, Kazuaki Iwasa, Keitaro Kuwahara, Hajime Sagayama, Hironori Nakao, Motoyuki Ishikado, Akiko Nakao, Seiko Ohira-Kawamura, Naoki Murai, Takashi Ohhara, and Yusuke Nambu
Author(s): Ami Shimoda, Kazuaki Iwasa, Keitaro Kuwahara, Hajime Sagayama, Hironori Nakao, Motoyuki Ishikado, Akiko Nakao, Seiko Ohira-Kawamura, Naoki Murai, Takashi Ohhara, and Yusuke Nambu

The so-called Remeika phase of the 3–4–13 class of materials is a candidate system for investigating topological electronic phenomena. The authors explore here an antiferromagnetic ordered structure comprising one-dimensional Nd chains connected via the triangular lattice in Nd3Rh4Sn13, which is superimposed on the chiral structure like that in several Remeika phase compounds. The results suggest that simultaneously broken spatial and time-reversal symmetries in this material open an avenue to investigate magnetic interactions mediated by the topological electrons protected by the noncentrosymmetric chiral structure.


[Phys. Rev. B 109, 134425] Published Tue Apr 16, 2024

Feature-energy duality of topological boundary states in a multilayer quantum spin Hall insulator
Yueh-Ting Yao, Xiaoting Zhou, Yi-Chun Hung, Hsin Lin, Arun Bansil, and Tay-Rong Chang
Author(s): Yueh-Ting Yao, Xiaoting Zhou, Yi-Chun Hung, Hsin Lin, Arun Bansil, and Tay-Rong Chang

Gapless topological boundary states characterize nontrivial topological phases that arise from the bulk-boundary correspondence in symmetry-protected topological materials. However, symmetry-breaking perturbations gap these edge bands, resulting in the loss of these crucial boundary states. In this …


[Phys. Rev. B 109, 155143] Published Tue Apr 16, 2024

Disorder-induced topological phase transition in a driven Majorana chain
Henry Ling, Philip Richard, Saeed Rahmanian Koshkaki, Michael Kolodrubetz, Dganit Meidan, Aditi Mitra, and T. Pereg-Barnea
Author(s): Henry Ling, Philip Richard, Saeed Rahmanian Koshkaki, Michael Kolodrubetz, Dganit Meidan, Aditi Mitra, and T. Pereg-Barnea

We study a periodically driven one-dimensional Kitaev model in the presence of disorder. In the clean limit our model exhibits four topological phases corresponding to the existence or nonexistence of edge modes at zero and $π$ quasienergy. When potential disorder is added, the system parameters get…


[Phys. Rev. B 109, 155144] Published Tue Apr 16, 2024

Double Dirac nodal lines enforced by multiple nonsymmorphic symmetries
Gijeong An, Yoonseok Hwang, Yunjae Kim, Changmo Kang, Yoonah Chung, Minsu Kim, Seyeong Cha, Changmin Jin, Yeryn Kim, Suklyun Hong, Bohm-Jung Yang, and Keun Su Kim
Author(s): Gijeong An, Yoonseok Hwang, Yunjae Kim, Changmo Kang, Yoonah Chung, Minsu Kim, Seyeong Cha, Changmin Jin, Yeryn Kim, Suklyun Hong, Bohm-Jung Yang, and Keun Su Kim

The topological quantum states of matter can be characterized by the geometric form and number of symmetry-enforced band degeneracy, such as nodal points, lines, and surfaces from twofold up to eightfold degeneracy. Here, we report the observation of double Dirac (fourfold) nodal lines stabilized by…


[Phys. Rev. B 109, 155146] Published Tue Apr 16, 2024

Twisted bilayer graphene revisited: Minimal two-band model for low-energy bands
Daniel Bennett, Daniel T. Larson, Louis Sharma, Stephen Carr, and Efthimios Kaxiras
Author(s): Daniel Bennett, Daniel T. Larson, Louis Sharma, Stephen Carr, and Efthimios Kaxiras

An accurate description of the low-energy electronic bands in twisted bilayer graphene (tBLG) is of great interest due to their relation to correlated electron phases such as superconductivity and Mott-insulator behavior at half-filling. The paradigmatic model of Bistritzer and MacDonald [Proc. Natl…


[Phys. Rev. B 109, 155422] Published Tue Apr 16, 2024

Real-space analysis of Hatsugai-Kohmoto interaction
Jan Skolimowski
Author(s): Jan Skolimowski

The Hatsugai-Kohmoto interaction model has gained a lot of attention in recent years, due to the fact it is exactly solvable in momentum space in any dimension while capturing some key features of the Mott phase. Here a one-dimensional lattice model with this interaction is approached from the real-…


[Phys. Rev. B 109, 165129] Published Tue Apr 16, 2024

Solving inverse problems using normalizing flow prior: Application to optical spectra
Jun H. Park, Juyeob Lee, and Jungseek Hwang
Author(s): Jun H. Park, Juyeob Lee, and Jungseek Hwang

We introduce a machine learning approach for solving ill-posed inverse problems, specifically addressing the Fredholm integral equation of the first kind. Harnessing the powerful capabilities of normalizing flows to approximate data distributions, combined with a robust probabilistic framework, our …


[Phys. Rev. B 109, 165130] Published Tue Apr 16, 2024

Instanton confinement-deconfinement transitions: Stability of pseudogap phases and topological order
Predrag Nikolić
Author(s): Predrag Nikolić

We explore the stability of certain many-body quantum states which may exist at zero or finite temperatures, may lack long-range order and even topological order, and still are thermodynamically distinct from uncorrelated disordered phases. We sharply characterize such states by the conservation of …


[Phys. Rev. B 109, 165132] Published Tue Apr 16, 2024

Making closed-shell lead pthalocyanine paramagnetic on Pb(100)
Jan Homberg, Alexander Weismann, and Richard Berndt
Author(s): Jan Homberg, Alexander Weismann, and Richard Berndt

Lead phthalocyanine (PbPc), a nonplanar molecule, is studied on Pb(100) by scanning tunneling spectroscopy. A rigid shift of the molecular orbitals is found between molecules with the central Pb ion pointing toward $(\mathrm{PbPc}↓)$ or away from $(\mathrm{PbPc}↑)$ the substrate and is understood fr…


[Phys. Rev. B 109, 165426] Published Tue Apr 16, 2024

Josephson junction of nodal superconductors with a Rashba and Ising spin-orbit coupling
Gal Cohen, Ranjani Seshadri, Maxim Khodas, and Dganit Meidan
Author(s): Gal Cohen, Ranjani Seshadri, Maxim Khodas, and Dganit Meidan

We study the effect of a Rashba spin-orbit coupling on the nodal superconducting phase of an Ising superconductor. Such nodal phase was predicted to occur when applying an in-plane field beyond the Pauli limit to a superconducting monolayer transition metal dichalcogenides (TMD). Generically, Rashba…


[Phys. Rev. B 109, 165427] Published Tue Apr 16, 2024

Emission of fast-propagating spin waves by an antiferromagnetic domain wall driven by spin current
Roman V. Ovcharov, B. A. Ivanov, Johan Åkerman, and Roman S. Khymyn
Author(s): Roman V. Ovcharov, B. A. Ivanov, Johan Åkerman, and Roman S. Khymyn

Antiferromagnets (AFMs) have great benefits for spintronic applications such as high frequencies (up to THz), high speeds (up to tens of km/s) of magnetic excitations, and field-free operation. Advanced devices will require high-speed propagating spin waves (SWs) as signal carriers, i.e., SWs with h…


[Phys. Rev. B 109, L140406] Published Tue Apr 16, 2024

Found 3 papers in prl
Date of feed: Wed, 17 Apr 2024 03:16:56 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Experimental Demonstration of Input-Output Indefiniteness in a Single Quantum Device
Yu Guo, Zixuan Liu, Hao Tang, Xiao-Min Hu, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, and Giulio Chiribella
Author(s): Yu Guo, Zixuan Liu, Hao Tang, Xiao-Min Hu, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, and Giulio Chiribella

Quantum theory allows information to flow through a single device in a coherent superposition of two opposite directions, resulting into situations where the input-output direction is indefinite. Here we introduce a theoretical method to witness input-output indefiniteness in a single quantum device…


[Phys. Rev. Lett. 132, 160201] Published Tue Apr 16, 2024

Cold-Atom Elevator: From Edge-State Injection to the Preparation of Fractional Chern Insulators
Botao Wang, Monika Aidelsburger, Jean Dalibard, André Eckardt, and Nathan Goldman
Author(s): Botao Wang, Monika Aidelsburger, Jean Dalibard, André Eckardt, and Nathan Goldman

Optical box traps offer new possibilities for quantum-gas experiments. Building on their exquisite spatial and temporal control, we propose to engineer system-reservoir configurations using box traps, in view of preparing and manipulating topological atomic states in optical lattices. First, we cons…


[Phys. Rev. Lett. 132, 163402] Published Tue Apr 16, 2024

Valley-Polarized Quantum Hall Phase in a Strain-Controlled Dirac System
G. Krizman, J. Bermejo-Ortiz, T. Zakusylo, M. Hajlaoui, T. Takashiro, M. Rosmus, N. Olszowska, J. J. Kołodziej, G. Bauer, Y. Guldner, G. Springholz, and L.-A. de Vaulchier
Author(s): G. Krizman, J. Bermejo-Ortiz, T. Zakusylo, M. Hajlaoui, T. Takashiro, M. Rosmus, N. Olszowska, J. J. Kołodziej, G. Bauer, Y. Guldner, G. Springholz, and L.-A. de Vaulchier

In multivalley systems, the valley pseudospin offers rich physics going from encoding of information by its polarization (valleytronics), to exploring novel phases of matter when its degeneracy is changed. Here, by strain engineering, we reveal fully valley-polarized quantum Hall phases in the ${\ma…


[Phys. Rev. Lett. 132, 166601] Published Tue Apr 16, 2024

Found 1 papers in prx
Date of feed: Wed, 17 Apr 2024 03:16:54 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Nernst Effect of High-Mobility Weyl Electrons in NdAlSi Enhanced by a Fermi Surface Nesting Instability
Rinsuke Yamada, Takuya Nomoto, Atsushi Miyake, Toshihiro Terakawa, Akiko Kikkawa, Ryotaro Arita, Masashi Tokunaga, Yasujiro Taguchi, Yoshinori Tokura, and Max Hirschberger
Author(s): Rinsuke Yamada, Takuya Nomoto, Atsushi Miyake, Toshihiro Terakawa, Akiko Kikkawa, Ryotaro Arita, Masashi Tokunaga, Yasujiro Taguchi, Yoshinori Tokura, and Max Hirschberger

A new mechanism to enhance the Nernst effect—wherein heat flow in a solid is converted to voltage—via magnetic fluctuations may lead to new applications in energy-harvesting devices.


[Phys. Rev. X 14, 021012] Published Tue Apr 16, 2024

Found 2 papers in pr_res
Date of feed: Wed, 17 Apr 2024 03:16:55 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Topologically protected Casimir effect for lattice fermions
C. W. J. Beenakker
Author(s): C. W. J. Beenakker

The electromagnetic Casimir effect has a fermionic counterpart in topological insulators: Zero-point fluctuations of a massless Dirac fermion field mediate a force between magnetic scatterers. The Casimir force is insensitive to disorder that preserves the topological protection of an unpaired Dirac…


[Phys. Rev. Research 6, 023058] Published Tue Apr 16, 2024

Explicit-time Floquet topological superconductivity in a microwave/infrared frequency AC voltage-driven Josephson junction
Donghao Wang, Zixuan Ding, Mengyao Li, Yongchun Tao, and Hao Fu
Author(s): Donghao Wang, Zixuan Ding, Mengyao Li, Yongchun Tao, and Hao Fu

Anomalous Floquet topological superconductivity with chirality can be achieved by applying a dc-bias voltage across the Josephson junction with a sandwiched magnetic topological insulator (TI), in which the intrinsic Josephson phase provides a time-dependent periodic driving [R.-X. Zhang and S. Das …


[Phys. Rev. Research 6, 023059] Published Tue Apr 16, 2024

Found 1 papers in nano-lett
Date of feed: Tue, 16 Apr 2024 13:08:11 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

[ASAP] Topology-Engineered Orbital Hall Effect in Two-Dimensional Ferromagnets
Zhiqi Chen, Runhan Li, Yingxi Bai, Ning Mao, Mahmoud Zeer, Dongwook Go, Ying Dai, Baibiao Huang, Yuriy Mokrousov, and Chengwang Niu

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c05129

Found 1 papers in sci-rep


Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

A unified SVPWM fault tolerant control algorithm for single leg fault reconstruction topology of two-level inverter
Xu Lihao

Scientific Reports, Published online: 17 April 2024; doi:10.1038/s41598-024-59425-5

A unified SVPWM fault tolerant control algorithm for single leg fault reconstruction topology of two-level inverter

Found 1 papers in small
Date of feed: Tue, 16 Apr 2024 07:27:43 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Strain Engineering of Twisted Bilayer Graphene: The Rise of Strain‐Twistronics
Yuan Hou, Jingzhuo Zhou, Minmin Xue, Maolin Yu, Ying Han, Zhuhua Zhang, Yang Lu
Small, EarlyView.

Found 1 papers in adv-mater
Date of feed: Tue, 16 Apr 2024 07:21:57 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Overcoming the Incompatibility Between Electrical Conductivity and Electromagnetic Transmissivity: A Graphene Glass Fiber Fabric Design Strategy
Kewen Huang, Fushun Liang, Jianbo Sun, Qinchi Zhang, Zhihao Li, Shuting Cheng, Wenjuan Li, Hao Yuan, Ruojuan Liu, Yunsong Ge, Yi Cheng, Kun Wang, Jun Jiang, Yuyao Yang, Mingyang Ma, Fan Yang, Ce Tu, Qin Xie, Wanjian Yin, Xiaobai Wang, Yue Qi, Zhongfan Liu
Advanced Materials, EarlyView.