Found 36 papers in cond-mat
Date of feed: Thu, 25 May 2023 00:30:00 GMT

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Anatomy of the fragmented Hilbert space: eigenvalue tunneling, quantum scars and localization in the perturbed random regular graph. (arXiv:2305.14416v1 [cond-mat.dis-nn])
Daniil Kochergin, Ivan M. Khaymovich, Olga Valba, Alexander Gorsky

We consider the properties of the random regular graph with node degree $d$ perturbed by chemical potentials $\mu_k$ for a number of short $k$-cycles. We analyze both numerically and analytically the phase diagram of the model in the $(\mu_k,d)$ plane. The critical curve separating the homogeneous and clusterized phases is found and it is demonstrated that the clusterized phase itself generically is separated as the function of $d$ into the phase with ideal clusters and phase with coupled ones when the continuous spectrum gets formed. The eigenstate spatial structure of the model is investigated and it is found that there are localized scar-like states in the delocalized part of the spectrum, that are related to the topologically equivalent nodes in the graph. We also reconsider the localization of the states in the non-perturbative band formed by eigenvalue instantons and find the semi-Poisson level spacing distribution. The Anderson transition for the case of combined ($k$-cycle) structural and diagonal (Anderson) disorders is investigated. It is found that the critical diagonal disorder gets reduced sharply at the clusterization phase transition, but does it unevenly in non-perturbative and mid-spectrum bands, due to the scars, present in the latter. The applications of our findings to $2$d quantum gravity are discussed.

Identifying non-Abelian anyons with upstream noise. (arXiv:2305.14422v1 [cond-mat.str-el])
Misha Yutushui, David F. Mross

Non-Abelian phases are among the most highly-prized but elusive states of matter. We show that upstream noise measurements can identify the putative non-Abelian fractional quantum Hall plateaus at filling factors $\nu=\frac{12}{5}$ or in any half-filled Landau level. Interfacing these states with any readily-available Abelian state yields a binary outcome of upstream noise or no noise. Judicious choices of the Abelian states can produce a sequence of yes--no outcomes that fingerprint the possible non-Abelian phase by ruling out its competitors.

Chiral model of twisted bilayer graphene realized in a monolayer. (arXiv:2305.14423v1 [cond-mat.mes-hall])
Valentin Crépel, Aaron Dunbrack, Daniele Guerci, John Bonini, Jennifer Cano

We demonstrate that a single layer of graphene subject to a superlattice potential nearly commensurate to a $\sqrt{3} \times \sqrt{3}$ supercell exactly maps to the chiral model of twisted bilayer graphene, albeit with half as many degrees of freedom. We comprehensively review the properties of this ``half-chiral model,'' including the interacting phases stabilized at integer fillings and the effects of substrate-induced symmetry breaking. We list candidate substrates that could produce a superlattice potential on graphene with the correct periodicity to access the flat band limit. Experimental measurements on a half-chiral moire heterostructure, in which valley-skyrmions cannot form, could yield insights on the physics they mediate in twisted bilayer graphene.

Noninvertible anomalies in $SU(N)\times U(1)$ gauge theories. (arXiv:2305.14425v1 [hep-th])
Mohamed M. Anber, Erich Poppitz

We study $4$-dimensional $SU(N)\times U(1)$ gauge theories with a single massless Dirac fermion in the $2$-index symmetric/antisymmetric representations and show that they are endowed with a noninvertible $0$-form $\widetilde {\mathbb Z}_{2(N\pm 2)}^{\chi}$ chiral symmetry along with a $1$-form $\mathbb Z_N^{(1)}$ center symmetry. By using the Hamiltonian formalism and putting the theory on a spatial three-torus $\mathbb T^3$, we construct the non-unitary gauge invariant operator corresponding to $\widetilde {\mathbb Z}_{2(N\pm 2)}^{\chi}$ and find that it acts nontrivially in sectors of the Hilbert space characterized by selected magnetic fluxes. When we subject $\mathbb T^3$ to $\mathbb Z_N^{(1)}$ twists, for $N$ even, in selected magnetic flux sectors, the algebra of $\widetilde {\mathbb Z}_{2(N\pm 2)}^{\chi}$ and $\mathbb Z_N^{(1)}$ fails to commute by a $\mathbb Z_2$ phase. We interpret this noncommutativity as a mixed anomaly between the noninvertible and the $1$-form symmetries. The anomaly implies that all states in the torus Hilbert space with the selected magnetic fluxes exhibit a two-fold degeneracy for arbitrary $\mathbb T^3$ size. The degenerate states are labeled by discrete electric fluxes and are characterized by nonzero expectation values of condensates.

Spin and Charge Fluctuation Induced Pairing in ABCB Tetralayer Graphene. (arXiv:2305.14438v1 [cond-mat.supr-con])
Ammon Fischer, Lennart Klebl, Jonas B. Hauck, Alexander Rothstein, Lutz Waldecker, Bernd Beschoten, Tim O. Wehling, Dante M. Kennes

Motivated by the recent experimental realization of ABCB stacked tetralayer graphene [Wirth et al., ACS Nano 16, 16617 (2022)], we study correlated phenomena in moir\'e-less graphene tetralayers for realistic interaction profiles using an orbital resolved random phase approximation approach. We demonstrate that magnetic fluctuations originating from local interactions are crucial close to the van Hove singularities on the electron- and hole-doped side promoting layer selective ferrimagnetic states. Spin fluctuations around these magnetic states enhance unconventional spin-triplet, valley-singlet superconductivity with $f$-wave symmetry due to intervalley scattering. Charge fluctuations arising from long range Coulomb interactions promote doubly degenerate $p$-wave superconductivity close to the van Hove singularities. At the conduction band edge of ABCB graphene, we find that both spin and charge fluctuations drive $f$-wave superconductivity. Our analysis suggests a strong competition between superconducting states emerging from long- and short-ranged Coulomb interactions and thus stresses the importance of microscopically derived interaction profiles to make reliable predictions for the origin of superconductivity in graphene based heterostructures.

Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene. (arXiv:2305.14472v1 [cond-mat.mes-hall])
Spenser Talkington, Eugene J. Mele

We report calculations of terahertz ellipticities in large-angle, 21.79$^\circ$ and 38.21$^\circ$, commensurate twisted bilayer graphene, and predict values as high as 1.5 millidegrees in the terahertz region for this non-magnetic material. This terahertz circular dichroism exhibits a magnitude comparable to that of chiral materials in the visible region. At low frequencies, the dichroic response is mediated by strong interlayer hybridization, which allows us to probe the symmetry and strength of these couplings. Crucially, lateral interlayer translation tunes this response, in contrast to small twist angle bilayer graphene's near invariance under under interlayer translation. We examine the magnitude and phase of the interlayer coupling for all structures containing fewer than 400 atoms per unit cell. Finally, we find that the dichroism can be manipulated by applying an electric field or with doping.

On the size of superconducting islands on the density-wave background in organic metals. (arXiv:2305.14510v1 [cond-mat.supr-con])
Vladislav D. Kochev, Seidali S. Seidov, Pavel D. Grigoriev

Most high-$T_c$ superconductors are spatially inhomogeneous. Usually, this heterogeneity originates from the interplay of various types of electronic ordering. It affects various superconducting properties, such as the transition temperature, magnetic upper critical field, critical current, etc. In this paper we analyze the parameters of spatial phase segregation during the first-order transition between superconductivity (SC) and a charge- or spin-density wave state in quasi-one-dimensional metals with imperfect nesting, typical to organic superconductors. An external pressure or another driving parameter increases the transfer integrals in electron dispersion, which only slightly affects SC but violates the Fermi-surface nesting and suppresses the density wave (DW). At a critical pressure $P_{c}$ the transition from DW to SC occurs. We estimate the characteristic size of SC islands during this phase transition in organic metals in two ways. Using the Ginzburg-Landau expansion we analytically obtain a lower bound for the size of SC domains. To estimate more specific interval of possible size of the SC islands in (TMTSF)$_2$PF$_6$ samples we perform numerical calculations of the percolation probability via SC domains and compare it with experimental resistivity data. This helps to develop a consistent microscopic description of SC spatial heterogeneity in various organic superconductors.

Berry Curvature and Topological Hall Effect in Magnetic Nanoparticles. (arXiv:2305.14519v1 [cond-mat.mtrl-sci])
Ahsan Ullah, Balamurugan Balasubramanian, Bibek Tiwari, Bharat Giri, David J. Sellmyer, Ralph Skomski, Xiaoshan Xu

Analytical calculations and micromagnetic simulations are used to determine the Berry curvature and topological Hall effect (THE) due to conduction electrons in small ferromagnetic particles. Our focus is on small particles of nonellipsoidal shapes, where noncoplanar spin structures yield a nonzero topological Hall signal quantified by the skyrmion number Q. We consider two mechanisms leading to noncoplanarity in aligned nanoparticles, namely flower-state spin configurations due to stray fields near corners and edges, and curling-type magnetostatic selfinteractions. In very small particles, the reverse magnetic fields enhance Q due to the flower state until the reversal occurs, whereas for particles with a radius greater than coherence radius Rcoh the Q jumps to a larger value at the nucleation field representing the transition from the flower state to the curling state. We calculate the Skyrmion density (average Berry curvature) from these spin structures as a function of particle size and applied magnetic field. Our simulation results agree with analytical calculations for both flower state and flux closure states. We showed the presence of Berry curvature in small particles as long as the size of the particle is less than the single domain limit. Using magnetic force microscopy (MFM), we also showed that in a nanodot of Co with a suitable size, a magnetic vortex state with perpendicular (turned-up) magnetization at the core is realized which can be manifested for Berry curvature and emergent magnetic field in confined geometries for single domain state at room temperature.

Topological edge state transfer via topological adiabatic passage. (arXiv:2305.14529v1 [quant-ph])
Chong Wang, Xiu Gu, Shu Chen, Yu-xi Liu

The study of quantum state transfer has led to a variety of research efforts utilizing quantum simulators. By exploiting the tunability of the qubit frequency and qubit-qubit coupling, a superconducting qubit chain can simulate various topological band models. In our study, we demonstrate that a spin-up state can be transported along a topological qubit chain by modulating the coupling strengths and the qubit frequencies. We here propose another more straightforward approach to theoretically interpret this state transfer process. We show that the Hilebert space of the qubit chain can be restricted into the subspace of the only two edge states when investigating this process, and the Hamiltonian can degenerate to a two-state Landau-Zener (LZ) model. Therefore the state transfer process in this topological qubit chain is equivalent to the same process through the adiabatic passage of the LZ model. Further more, we show how to use this approach to generalize the state transfer process from one-qubit Fock state to two-qubit Bell state.

Bottom-up Integration of TMDCs with Pre-Patterned Device Architectures via Transfer-free Chemical Vapor Deposition. (arXiv:2305.14554v1 [cond-mat.mtrl-sci])
Lucas M. Sassi, Sathvik Ajay Iyengar, Anand B. Puthirath, Yuefei Huang, Xingfu Li, Tanguy Terlier, Ali Mojibpour, Ana Paula C. Teixeira, Palash Bharadwaj, Chandra Sekhar Tiwary, Robert Vajtai, Saikat Talapatra, Boris Yakobson, Pulickel M. Ajayan

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) remain a topic of immense interest. Specifically, given their low operational switching costs, they find many niche applications in new computing architectures with the promise of continued miniaturization. However, challenges lie in Back End of Line (BEOL) integration temperature and time compliance regarding current requirements for crystal growth. Additionally, deleterious and time-consuming transfer processes and multiple steps involved in channel/contact engineering can cripple device performance. This work demonstrates kinetics-governed in-situ growth regimes (surface or edge growth from gold) of WSe2 and provides a mechanistic understanding of these regimes via energetics across various material interfaces. As a proof-of-concept, field effect transistors (FET) with an in-situ grown WSe2 channel across Au contacts are fabricated, demonstrating a 2D semiconductor transistor via a transfer-free method within the 450-600 C 2h-time window requirement BEOL integration. We leverage directional edge growth to fabricate contacts with robust thickness-dependent Schottky-to-Ohmic behavior. By transitioning between Au and SiO2 growth substrates in situ, this work achieves strain-induced subthreshold swing of 140 mV/decade, relatively high mobility of 107 +- 19 cm2V-1s-1, and robust ON/OFF ratios 10^6 in the fabricated FETs.

Statistical mechanics of nanotubes. (arXiv:2305.14602v1 [cond-mat.stat-mech])
Siddhartha Sarkar, Mohamed El Hedi Bahri, Andrej Košmrlj

We investigate the effect of thermal fluctuations on the mechanical properties of nanotubes by employing tools from statistical physics. For 2D sheets it was previously shown that thermal fluctuations effectively renormalize elastic moduli beyond a characteristic temperature-dependent thermal length scale (a few nanometers for graphene at room temperature), where the bending rigidity increases, while the in-plane elastic moduli reduce in a scale-dependent fashion with universal power law exponents. However, the curvature of nanotubes produces new phenomena. In nanotubes, competition between stretching and bending costs associated with radial fluctuations introduces a characteristic elastic length scale, which is proportional to the geometric mean of the radius and effective thickness. Beyond elastic length scale, we find that the in-plane elastic moduli stop renormalizing in the axial direction, while they continue to renormalize in the circumferential direction beyond the elastic length scale albeit with different universal exponents. The bending rigidity, however, stops renormalizing in the circumferential direction at the elastic length scale. These results were verified using molecular dynamics simulations.

Field-direction-dependent skyrmion crystals in noncentrosymmetric cubic magnets: A comparison between point groups $(O,T)$ and $T_{\rm d}$. (arXiv:2305.14619v1 [cond-mat.str-el])
Satoru Hayami, Ryota Yambe

We investigate the instability toward a skyrmion crystal (SkX) in noncentrosymmetric cubic magnets with an emphasis on a comparison between point groups $(O,T)$ and $T_{\rm d}$. By constructing low-temperature magnetic phase diagrams under an external magnetic field for three directions based on numerically simulated annealing, we find that the system under the point group $(O,T)$ exhibits different two types of SkXs depending on the field direction, while that under $T_{\rm d}$ does not show such an instability. The difference between them is understood from the difference in the momentum-dependent Dzyaloshinskii-Moriya interaction under each point group. Meanwhile, we show that the system under $T_{\rm d}$ leads to the SkX instability by considering an additional effect of the uniaxial strain, which lowers the symmetry to $D_{\rm 2d}$. We obtain two different SkXs: N\'eel-type and anti-type SkXs, the former of which is stabilized in the presence of the interactions at the three-dimensional ordering wave vectors. The present results provide rich topological spin textures in the three-dimensional systems, which are sensitive to the magnetic-field direction and point-group symmetry.

Phases of 4He and H2 adsorbed on a single carbon nanotube. (arXiv:2305.14774v1 [cond-mat.other])
M. C. Gordillo, J. Boronat

Using a diffusion Monte Carlo (DMC) technique, we calculated the phase diagrams of $^4$He and H$_2$ adsorbed on a single (5,5) carbon nanotube, one of the narrowest that can be obtained experimentally. For a single monolayer, when the adsorbate density increases, both species undergo a series of first order solid-solid phase transitions between incommensurate arrangements. Remarkably, the $^4$He lowest-density solid phase shows supersolid behavior in contrast with the normal solid that we found for H$_2$. The nature of the second-layer is also different for both adsorbates. Contrarily to what happens on graphite, the second-layer of $^4$He on that tube is a liquid, at least up to the density corresponding to a third-layer promotion on a flat substrate. However, the second-layer of H$_2$ is a solid that, at its lowest stable density, has a small but observable superfluid fraction.

Topological Phases in Magnonics: A Review. (arXiv:2305.14861v1 [cond-mat.mes-hall])
Fengjun Zhuo, Jian Kang, Aurélien Manchon, Zhenxiang Cheng

Magnonics or magnon spintronics is an emerging field focusing on generating, detecting, and manipulating magnons. As charge-neutral quasi-particles, magnons are promising information carriers because of their low energy dissipation and long coherence length. In the past decade, topological phases in magnonics have attracted intensive attention due to their fundamental importance in condensed-matter physics and potential applications of spintronic devices. In this review, we mainly focus on recent progress in topological magnonics, such as the Hall effect of magnons, magnon Chern insulators, topological magnon semimetals, etc. In addition, the evidence supporting topological phases in magnonics and candidate materials are also discussed and summarized. The aim of this review is to provide readers with a comprehensive and systematic understanding of the recent developments in topological magnonics.

Faraday rotation and transmittance as markers of topological phase transitions in 2D materials. (arXiv:2305.14923v1 [cond-mat.mes-hall])
M. Calixto, A. Mayorgas, N. A. Cordero, E. Romera, O. Castaños

We analyze the magneto-optical conductivity (and related magnitudes like transmittance and Faraday rotation of the irradiated polarized light) of some elemental two-dimensional Dirac materials of group IV (graphene analogues, buckled honeycomb lattices, like silicene, germanene, stannane, etc.), group V (phosphorene), and zincblende heterostructures (like HgTe/CdTe quantum wells) near the Dirac and gamma points, under out-of-plane magnetic and electric fields, to characterize topological-band insulator phase transitions and their critical points. We provide plots of the Faraday angle and transmittance as a function of the polarized light frequency, for different external electric and magnetic fields, chemical potential, HgTe layer thickness and temperature, to tune the material magneto-optical properties. We have shown that absortance/transmittance acquires extremal values at the critical point, where the Faraday angle changes sign, thus providing fine markers of the topological phase transition.

Structure prediction and characterization of CuI-based ternary $p$-type transparent conductors. (arXiv:2305.14941v1 [cond-mat.mtrl-sci])
Michael Seifert (1), Tomáš Rauch (1), Miguel A. L. Marques (2), Silvana Botti (1 and 3) ((1) Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena and European Theoretical Spectroscopy Facility, (2) Research Center Future Energy Materials and Systems of the University Alliance Ruhr, Faculty of Mechanical Engineering, Ruhr University Bochum, (3) Research Center Future Energy Materials and Systems, Faculty of Physics and Astronomy, Ruhr Universität Bochum)

Zincblende copper iodide has attracted significant interest as a potential material for transparent electronics, thanks to its exceptional light transmission capabilities in the visible range and remarkable hole conductivity. However, remaining challenges hinder the utilization of copper iodide's unique properties in real-world applications. To address this, chalcogen doping has emerged as a viable approach to enhance the hole concentration in copper iodide. In search of further strategies to improve and tune the electronic properties of this transparent semiconductor, we investigate the ternary phase diagram of copper and iodine with sulphur or selenium by performing structure prediction calculations using the minima hopping method. As a result, we find 11 structures located on or near the convex hull, 9 of which are unreported. Based on our band structure calculations, it appears that sulphur and selenium are promising candidates for achieving ternary semiconductors suitable as $p$-type transparent conducting materials. Additionally, our study reveals the presence of unreported phases that exhibit intriguing topological properties. These findings broaden the scope of potential applications for these ternary systems, highlighting the possibility of harnessing their unique electronic characteristics in diverse electronic devices and systems.

Gate control of Mott metal-insulator transition in a 2D metal-organic framework. (arXiv:2305.14983v1 [cond-mat.str-el])
Benjamin Lowe, Bernard Field, Jack Hellerstedt, Julian Ceddia, Henry L. Nourse, Ben J. Powell, Nikhil V. Medhekar, Agustin Schiffrin

Strong electron-electron Coulomb interactions in materials can lead to a vast range of exotic many-body quantum phenomena, including Mott metal-insulator transitions, magnetic order, quantum spin liquids, and unconventional superconductivity. These many-body phases are strongly dependent on band occupation and can hence be controlled via the chemical potential. Flat electronic bands in two-dimensional (2D) and layered materials such as the kagome lattice, enhance strong electronic correlations. Although theoretically predicted, correlated-electron phases in monolayer 2D metal-organic frameworks (MOFs) - which benefit from efficient synthesis protocols and tunable properties - with a kagome structure have not yet been realised experimentally. Here, we synthesise a 2D kagome MOF comprised of 9,10-dicyanoanthracene molecules and copper atoms on an atomically thin insulator, monolayer hexagonal boron nitride (hBN) on Cu(111). Scanning tunnelling microscopy (STM) and spectroscopy reveal an electronic energy gap of ~200 meV in this MOF, consistent with dynamical mean-field theory predictions of a Mott insulating phase. By tuning the electron population of kagome bands, via either template-induced (via local work function variations of the hBN/Cu(111) substrate) or tip-induced (via the STM probe) gating, we are able to induce Mott metal-insulator transitions in the MOF. These findings pave the way for devices and technologies based on 2D MOFs and on electrostatic control of many-body quantum phases therein.

Experimental Verification of Many-Body Entanglement Using Thermodynamic Quantities. (arXiv:2305.15012v1 [quant-ph])
Jitendra Joshi, Mir Alimuddin, T S Mahesh, Manik Banik

The phenomenon of quantum entanglement underlies several important protocols that enable emerging quantum technologies. Being an extremely delicate resource entangled states easily get perturbed by their external environment, and thus makes the question of entanglement certification immensely crucial for successful implementation of the protocols involving entanglement. In this work, we propose a set of entanglement criteria for multi-qubit systems that can be easily verified by measuring certain thermodynamic quantities. In particular, the criteria depend on the difference in optimal works extractable from an isolated quantum system under global and local interactions, respectively. As a proof of principle, we demonstrate the proposed thermodynamic criteria on nuclear spin registers of up to 10 qubits using Nuclear Magnetic Resonance architecture. We prepare noisy Greenberger-Horne-Zeilinger class of states in star-topology systems and certify their entanglement through our proposed criteria. We also provide elegant means of entanglement certification in many-body systems when only partial or even no knowledge about the state is available.

Manipulation of magnetic solitons under the influence of DMI gradients. (arXiv:2305.15052v1 [cond-mat.mes-hall])
Rayan Moukhader, Davi Rodrigues, Eleonora Raimondo, Vito Puliafito, Bruno Azzerboni, Mario Carpentieri, Abbass Hamadeh, Giovanni Finocchio, Riccardo Tomasello

Magnetic solitons are promising for applications due to their intrinsic properties such as small size, topological stability, ultralow power manipulation and potentially ultrafast operations. To date, research has focused on the manipulation of skyrmions, domain walls, and vortices by applied currents. The discovery of new methods to control magnetic parameters, such as the interfacial Dzyaloshinskii-Moriya interaction (DMI) by strain, geometry design, temperature gradients, and applied voltages promises new avenues for energetically efficient manipulation of magnetic structures. The latter has shown significant progress in 2d material-based technology. In this work, we present a comprehensive study using numerical and analytical methods of the stability and motion of different magnetic textures under the influence of DMI gradients. Our results show that under the influence of linear DMI gradients, N\'eel and Bloch-type skyrmions and radial vortex exhibit motion with finite skyrmion Hall angle, while the circular vortex undergoes expulsion dynamics. This work provides a deeper and crucial understanding of the stability and gradient-driven dynamics of magnetic solitons, and paves the way for the design of alternative low-power sources of magnetization manipulation in the emerging field of 2d materials.

Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2. (arXiv:2305.15144v1 [cond-mat.mes-hall])
Akihiro Ozawa, Koji Kobayashi, Kentaro Nomura

We theoretically study the spin Hall effect in a simple tight-binding model of stacked-kagome Weyl semimetal Co3Sn2S2 with ferromagnetic ordering. We focus on the two types of the spin Hall current: one flowing in the in-plane direction with respect to the kagome lattice (in-plane spin Hall current), and one flowing in the stacking direction (out-of-plane spin Hall current). We show the spin Hall conductivities for those spin currents drastically change depending on the direction of the magnetic moment. Especially, the out-of-plane spin Hall current may induce surface spin accumulation, which are useful for the perpendicular magnetization switching via spin-orbit torque.

Topological surface states hybridized with bulk states of Bi-doped PbSb2Te4 revealed in quasiparticle interference. (arXiv:2305.15198v1 [cond-mat.mtrl-sci])
Yuya Hattori, Keisuke Sagisaka, Shunsuke Yoshizawa, Yuki Tokumoto, Keiichi Edagawa

Topological surface states of Bi-doped PbSb2Te4 [Pb(Bi0.20Sb0.80)2Te4] are investigated through analyses of quasiparticle interference (QPI) patterns observed by scanning tunneling microscopy. Interpretation of the experimental QPI patterns in the reciprocal space is achieved by numerical QPI simulations using two types of surface density of states produced by density functional theory calculations or a kp surface state model. We found that the Dirac point (DP) of the surface state appears in the bulk band gap of this material and, with the energy being away from the DP, the isoenergy contour of the surface state is substantially deformed or separated into segments due to hybridization with bulk electronic states. These findings provide a more accurate picture of topological surface states, especially at energies away from the DP, providing valuable insight into the electronic properties of topological insulators.

Dirac half-semimetallicity and antiferromagnetism in graphene nanoribbon/hexagonal boron nitride heterojunctions. (arXiv:2305.15214v1 [cond-mat.mtrl-sci])
Nikita V. Tepliakov, Ruize Ma, Johannes Lischner, Efthimios Kaxiras, Arash A. Mostofi, Michele Pizzochero

Half-metals have been envisioned as active components in spintronic devices by virtue of their completely spin-polarized electrical currents. Actual materials hosting half-metallic phases, however, remain scarce. Here, we predict that recently fabricated heterojunctions of zigzag nanoribbons embedded in two-dimensional hexagonal boron nitride are half-semimetallic, featuring fully spin-polarized Dirac points at the Fermi level. The half-semimetallicity originates from the transfer of charges from hexagonal boron nitride to the embedded graphene nanoribbon. These charges give rise to opposite energy shifts of the states residing at the two edges while preserving their intrinsic antiferromagnetic exchange coupling. Upon doping, an antiferromagnetic-to-ferrimagnetic phase transition occurs in these heterojunctions, with the sign of the excess charge controlling the spatial localization of the net magnetic moments. Our findings demonstrate that such heterojunctions realize tunable one-dimensional conducting channels of spin-polarized Dirac fermions that are seamlessly integrated into a two-dimensional insulator, thus holding promise for the development of carbon-based spintronics.

Topological defects reveal the plasticity of glasses. (arXiv:2305.15226v1 [cond-mat.soft])
Matteo Baggioli

Mixing theoretical topological structures with cutting-edge simulation methods, a recent study in Nature Communications has finally confirmed the existence of topological defects in glasses and their crucial role for plasticity.

Bending-induced isostructural transitions in ultrathin layers of van der Waals ferrielectrics. (arXiv:2305.15247v1 [cond-mat.mtrl-sci])
Anna N. Morozovska, Eugene A. Eliseev, Yongtao Liu, Kyle P. Kelley, Ayana Ghosh, Ying Liu, Jinyuan Yao, Nicholas V. Morozovsky, Andrei L Kholkin, Yulian M. Vysochanskii, Sergei V. Kalinin

Using Landau-Ginzburg-Devonshire (LGD) phenomenological approach we analyze the bending-induced re-distribution of electric polarization and field, elastic stresses and strains inside ultrathin layers of van der Waals ferrielectrics. We consider a CuInP2S6 (CIPS) thin layer with fixed edges and suspended central part, the bending of which is induced by external forces. The unique aspect of CIPS is the existence of two ferrielectric states, FI1 and FI2, corresponding to big and small polarization values, which arise due to the specific four-well potential of the eighth-order LGD functional. When the CIPS layer is flat, the single-domain FI1 state is stable in the central part of the layer, and the FI2 states are stable near the fixed edges. With an increase of the layer bending below the critical value, the sizes of the FI2 states near the fixed edges decreases, and the size of the FI1 region increases. When the bending exceeds the critical value, the edge FI2 states disappear being substituted by the FI1 state, but they appear abruptly near the inflection regions and expand as the bending increases. The bending-induced isostructural FI1-FI2 transition is specific for the bended van der Waals ferrielectrics described by the eighth (or higher) order LGD functional with consideration of linear and nonlinear electrostriction couplings. The isostructural transition, which is revealed in the vicinity of room temperature, can significantly reduce the coercive voltage of ferroelectric polarization reversal in CIPS nanoflakes, allowing for the curvature-engineering control of various flexible nanodevices.

Defining a quantum active particle using non-Hermitian quantum walk. (arXiv:2305.15319v1 [quant-ph])
Manami Yamagishi, Naomichi Hatano, Hideaki Obuse

The main aim of the present paper is to define an active matter in a quantum framework and investigate difference and commonalities of quantum and classical active matters. Although the research field of active matter has been expanding wider and wider, most research is conducted in classical systems; on the contrary, there is no universal theoretical framework for quantum active matter. We here propose a truly quantum active-matter model with a non-Hermitian quantum walk and show numerical results in one- and two-dimensional systems. We aim to reproduce similar results that Schweitzer \textit{et al.} obtained with their classical active Brownian particle; that is, the Brownian particle, with a finite energy take-up, becomes active and climbs up a potential wall. We realize such a system with non-Hermitian quantum walks. We introduce new internal states, the ground state and the excited state, and a new non-Hermitian operator $N(g)$ for an asymmetric transition between both states. The non-Hermiticity parameter $g$ promotes transition to the excited state and hence the particle takes up energy from the environment. We realize a system without momentum conservation by manipulating a parameter $\theta$ for the coin operator for a discrete-time quantum walk; we utilize the property that the continuum limit of a one-dimensional discrete-time quantum walk gives the Dirac equation with its mass proportional to the parameter $\theta$. With our quantum active particle, we successfully observe that the movement of the quantum walker becomes more active in a non-trivial way as we increase the non-Hermiticity parameter $g$, which is similar to the classical active Brownian particle. Meanwhile, we also observe unique features of quantum walks, namely, ballistic propagation of peaks (1D) and the walker staying on the constant energy plane (2D).

Flat band separation and robust spin-Berry curvature in bilayer kagome metals. (arXiv:2305.15345v1 [cond-mat.str-el])
Domenico Di Sante, Chiara Bigi, Philipp Eck, Stefan Enzner, Armando Consiglio, Ganesh Pokharel, Pietro Carrara, Pasquale Orgiani, Vincent Polewczyk, Jun Fujii, Phil D. C King, Ivana Vobornik, Giorgio Rossi, Ilija Zeljkovic, Stephen D. Wilson, Ronny Thomale, Giorgio Sangiovanni, Giancarlo Panaccione, Federico Mazzola

Kagome materials have emerged as a setting for emergent electronic phenomena that encompass different aspects of symmetry and topology. It is debated whether the XV$_6$Sn$_6$ kagome family (where X is a rare earth element), a recently discovered family of bilayer kagome metals, hosts a topologically non-trivial ground state resulting from the opening of spin-orbit coupling gaps. These states would carry a finite spin-Berry curvature, and topological surface states. Here, we investigate the spin and electronic structure of the XV$_6$Sn$_6$ kagome family. We obtain evidence for a finite spin-Berry curvature contribution at the center of the Brillouin zone, where the nearly flat band detaches from the dispersing Dirac band because of spin-orbit coupling. In addition, the spin-Berry curvature is further investigated in the charge density wave regime of ScV$_6$Sn$_6$, and it is found to be robust against the onset of the temperature-driven ordered phase. Utilizing the sensitivity of angle resolved photoemission spectroscopy to the spin and orbital angular momentum, our work unveils the spin-Berry curvature of topological kagome metals, and helps to define its spectroscopic fingerprint.

Half unit cell shift defect induced helical states in Fe-based chalcogenide superconductors. (arXiv:2305.15373v1 [cond-mat.supr-con])
Tamoghna Barik, Jay D. Sau

Recent scanning tunneling spectroscopy along crystalline domain-walls associated with a half unit cell shift have revealed sub-gap density of states that are expected to arise from helical Majorana modes. Such propagating Majorana modes have been proposed to exist on the surface state of topological materials similar to FeTe$_{\text{1-x}}$Se$_\text{x}$ (FTS) along line defects where the superconducting order parameter (OP) is phase shifted by $\pi$. Here we show that such a $\pi$ shift in theOP across the half unit-cell shift domain-wall can occur in quite conventional tight-binding models of superconducting FTS as a result of the $s_{\pm}$ pairing symmetry across $\Gamma$ and M pockets of FTS. The resultant inter-pocket transmission between $\Gamma$ and M pockets is found to be typically larger than the intra-pocket transmissions. We confirm these conclusions with a calculation based on the Bogoliubov-de-Gennes (BdG) formalism which shows that a $\pi$-shift across the domain-wall is favored for a large range of model parameters for FTS. We discuss parameter regimes where this mechanism might explain the STS experiments as well as propose to test this explanation by searching for evidence of large inter-pocket scattering.

Tricritical behavior in dynamical phase transitions. (arXiv:2212.03324v2 [cond-mat.stat-mech] UPDATED)
Tal Agranov, Michael E. Cates, Robert L. Jack

We identify a new scenario for dynamical phase transitions associated with time-integrated observables occurring in diffusive systems described by the macroscopic fluctuation theory. It is characterized by the pairwise meeting of first- and second-order bias-induced phase transition curves at two tricritical points. We formulate a simple, general criterion for its appearance and derive an exact Landau theory for the tricritical behavior. The scenario is demonstrated in three examples: the simple symmetric exclusion process biased by an activity-related structural observable; the Katz-Lebowitz-Spohn lattice gas model biased by its current; and in an active lattice gas biased by its entropy production.

A symmetry-protected exceptional ring in a photonic crystal with negative index media. (arXiv:2212.11090v2 [cond-mat.mes-hall] UPDATED)
Takuma Isobe, Tsuneya Yoshida, Yasuhiro Hatsugai

Non-Hermitian topological band structures such as symmetry-protected exceptional rings (SPERs) can emerge for systems described by the generalized eigenvalue problem (GEVP) with Hermitian matrices. In this paper, we numerically analyze a photonic crystal with negative index media, which is described by the GEVP with Hermitian matrices. Our analysis using COMSOL Multiphysics demonstrates that a SPER emerges for photonic crystals composed of split-ring resonators and metal-wire structures. We expect that the above SPER can be observed in experiments as it emerges at a finite frequency.

Theory of Edge Effects and Conductunce for Applications in Graphene-based Nanoantennas. (arXiv:2301.02441v2 [cond-mat.mes-hall] UPDATED)
Tomer Berghaus, Touvia Miloh, Oded Gottlieb, Gregory Slepyan

In this paper, we develop a theory of edge effects in graphene for its applications to nanoantennas in the terahertz, infrared, and visible frequency ranges. Its characteristic feature is selfconsistence reached due the formulation in terms of dynamical conductance instead of ordinary used surface conductivity. The physical model of edge effects is based on using the concept of Dirac fermions. The surface conductance is considered as a general susceptibility and is calculated via the Kubo approach. In contrast with earlier models, the surface conductance becomes nonhomogeneous and nonlocal. The spatial behavior of the surface conductance depends on the length of the sheet and the electrochemical potential. Results of numerical simulations are presented for lengths in the range of 2.1-800 nm and electrochemical potentials ranging between 0.1-1.0 eV. It is shown that if the length exceeded 800 nm, our model agrees with the classical Drude conductivity model with a relatively high degree of accuracy. For rather short lengths, the conductance usually exhibits spatial oscillations, which absent in conductivity and strongly affect the properties of graphene based antennas. The period and amplitude of such spatial oscillations, strongly depend on the electrochemical potential. The new theory opens the way for realizing electrically controlled nanoantennas by changing the electrochemical potential may of the gate voltage. The obtained results may be applicable for the design of carbon based nanodevices in modern quantum technologies.

Many topological regions on the Bloch sphere of the spin-1/2 double kicked top. (arXiv:2301.08225v2 [quant-ph] UPDATED)
J. Mumford

Floquet topological systems have been shown to exhibit features not commonly found in conventional topological systems such as topological phases characterized by arbitrarily large winding numbers. This is clearly highlighted in the quantum double kicked rotor coupled to spin-1/2 degrees of freedom [Phys. Rev. A 97, 063603 (2018)] where large winding numbers are achieved by tuning the kick strengths. Here, we extend the results to the spin-1/2 quantum double kicked top and find not only does the system exhibit topological regions with large winding numbers, but a large number of them are needed to fully characterize the topology of the Bloch sphere of the top for general kick strengths. Due to the geometry of the Bloch sphere it is partitioned into regions with different topology and the boundaries separating them are home to 0 and $\pi$ quasienergy bound states. We characterize the regions by comparing local versions of the mean field, quantum and mean chiral displacement winding numbers. We also use a probe state to locate the boundaries by observing localization as the state evolves when it has a large initial overlap with bound states. Finally, we briefly discuss the connections between the spin-1/2 quantum double kicked top and multi-step quantum walks, putting the system in the context of some current experiments in the exploration of topological phases.

Quasi-2D Fermi surface in the anomalous superconductor UTe2. (arXiv:2302.04758v2 [cond-mat.supr-con] UPDATED)
A. G. Eaton, T. I. Weinberger, N. J. M. Popiel, Z. Wu, A. J. Hickey, A. Cabala, J. Pospisil, J. Prokleska, T. Haidamak, G. Bastien, P. Opletal, H. Sakai, Y. Haga, R. Nowell, S. M. Benjamin, V. Sechovsky, G. G. Lonzarich, F. M. Grosche, M. Valiska

Spin-triplet superconductors represent a fascinating platform with which to explore the technological potential of emergent topological excitations. While candidate triplet superconductors are rare, one especially promising material is the heavy fermion paramagnet uranium ditelluride (UTe$_2$), which has recently been found to exhibit numerous characteristics of an unconventional spin-triplet pairing state. To date, efforts to understand the microscopic details of superconductivity in UTe$_2$ have been severely impeded by uncertainty regarding the underlying electronic structure. Here, we directly probe the Fermi surface of UTe$_2$ by measuring magnetic quantum oscillations in ultra-pure crystals, as evidenced by their high superconducting transition temperature $T_\text{c} \approx$ 2.1 K and residual resistivity ratio (RRR) $\approx$ 900. We find an angular profile of quantum oscillatory frequency and amplitude that is characteristic of a quasi-2D Fermi surface, exhibiting heavy effective masses up to 78(2) $m_e$ owing to strong correlations. We performed Fermi surface simulations guided by these data, yielding excellent correspondence between quantum oscillation measurements and our resultant Fermi surface model, which consists of two cylindrical sections of electron- and hole-type respectively. A comparison between the density of states at the Fermi level inferred from the quantum oscillations, and the normal state Sommerfeld coefficient obtained from specific heat measurements, gives excellent agreement with our Fermi surface model. Additionally, we find that both cylindrical Fermi sheets possess negligible corrugation, which may allow for their near-nesting and therefore promote magnetic fluctuations that enhance the triplet pairing mechanism. Our results place strong constraints on the possible symmetry of the superconducting order parameter in UTe$_2$.

Mach--Zehnder-like interferometry with graphene nanoribbon networks. (arXiv:2302.04821v2 [cond-mat.mes-hall] UPDATED)
Sofia Sanz, Nick Papior, Géza Giedke, Daniel Sánchez-Portal, Mads Brandbyge, Thomas Frederiksen

We study theoretically electron interference in a Mach--Zehnder-like geometry formed by four zigzag graphene nanoribbons (ZGNRs) arranged in parallel pairs, one on top of the other, such that they form intersection angles of 60$^\circ$. Depending on the interribbon separation, each intersection can be tuned to act either as an electron beam splitter or as a mirror, enabling tuneable circuitry with interfering pathways. Based on the mean-field Hubbard model and Green's function techniques, we evaluate the electron transport properties of such 8-terminal devices and identify pairs of terminals that are subject to self-interference. We further show that the scattering matrix formalism in the approximation of independent scattering at the four individual junctions provides accurate results as compared with the Green's function description, allowing for a simple interpretation of the interference process between two dominant pathways. This enables us to characterize the device sensitivity to phase shifts from an external magnetic flux according to the Aharonov--Bohm effect as well as from small geometric variations in the two path lengths. The proposed devices could find applications as magnetic field sensors and as detectors of phase shifts induced by local scatterers on the different segments, such as adsorbates, impurities or defects. The setup could also be used to create and study quantum entanglement.

A physically realizable molecular motor driven by the Landauer blowtorch effect. (arXiv:2304.01408v2 [cond-mat.mes-hall] UPDATED)
Riley J. Preston, Daniel S. Kosov

We propose a model for a molecular motor in a molecular electronic junction driven by a natural manifestation of Landauer's blowtorch effect. The effect emerges via the interplay of the electronic friction and diffusion coefficients, each calculated quantum mechanically using nonequilibrium Green's functions, within a semi-classical Langevin description of the rotational dynamics. The motor functionality is analysed through numerical simulations where the rotations exhibit a directional preference according to the intrinsic geometry of the molecular configuration. The proposed mechanism for motor function is expected to be ubiquitous for a range of molecular geometries beyond the one examined here.

Autonomous decision making for solid-state synthesis of inorganic materials. (arXiv:2304.09353v2 [cond-mat.mtrl-sci] UPDATED)
Nathan J. Szymanski, Pragnay Nevatia, Christopher J. Bartel, Yan Zeng, Gerbrand Ceder

To aid in the automation of inorganic materials synthesis, we introduce an algorithm (ARROWS3) that guides the selection of precursors used in solid-state reactions. Given a target phase, ARROWS3 iteratively proposes experiments and learns from their outcomes to identify an optimal set of precursors that leads to maximal yield of that target. Initial experiments are selected based on thermochemical data collected from first principles calculations, which enable the identification of precursors exhibiting large thermodynamic force to form the desired target. Should the initial experiments fail, their associated reaction paths are determined by sampling a range of synthesis temperatures and identifying their products. ARROWS3 then uses this information to pinpoint which intermediate reactions consume most of the available free energy associated with the starting materials. In subsequent experimental iterations, precursors are selected to avoid such unfavorable reactions and therefore maintain a strong driving force to form the target. We validate this approach on three experimental datasets containing results from more than 200 distinct synthesis procedures. When compared to several black-box optimization algorithms, ARROWS3 identifies the most effective set of precursors for each target while requiring substantially fewer experimental iterations. These findings highlight the importance of using domain knowledge in the design of optimization algorithms for materials synthesis, which are critical for the development of fully autonomous research platforms.

Observation and enhancement of room temperature bilinear magnetoelectric resistance in sputtered topological semimetal Pt3Sn. (arXiv:2305.10720v2 [cond-mat.mtrl-sci] UPDATED)
Yihong Fan, Zach Cresswell, Yifei Yang, Wei Jiang, Yang Lv, Thomas Peterson, Delin Zhang, Jinming Liu, Tony Low, Jian-ping Wang

Topological semimetal materials have become a research hotspot due to their intrinsic strong spin-orbit coupling which leads to large charge-to-spin conversion efficiency and novel transport behaviors. In this work, we have observed a bilinear magnetoelectric resistance (BMER) of up to 0.1 nm2A-1Oe-1 in a singlelayer of sputtered semimetal Pt3Sn at room temperature. Different from previous observations, the value of BMER in sputtered Pt3Sn does not change out-of-plane due to the polycrystalline nature of Pt3Sn. The observation of BMER provides strong evidence of the existence of spin-momentum locking in the sputtered polycrystalline Pt3Sn. By adding an adjacent CoFeB magnetic layer, the BMER value of this bilayer system is doubled compared to the single Pt3Sn layer. This work broadens the material system in BMER study, which paves the way for the characterization of topological states and applications for spin memory and logic devices.

Found 7 papers in prb
Date of feed: Thu, 25 May 2023 03:17:15 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]+)

Renormalization of antiferromagnetic magnons by superconducting condensate and quasiparticles
A. M. Bobkov, S. A. Sorokin, and I. V. Bobkova
Author(s): A. M. Bobkov, S. A. Sorokin, and I. V. Bobkova

The ability to modify and tune the spin-wave dispersion is one of the most important requirements for engineering of magnonic networks. In this study, we demonstrate the promise of synthetic thin-film hybrids composed of an antiferromagnetic insulator (AF) and a normal (N) or superconducting (S) met…

[Phys. Rev. B 107, 174521] Published Wed May 24, 2023

Electrically driven insulator-to-metal transition in a correlated insulator: Electronic mechanism and thermal description
Manuel I. Díaz, Jong E. Han, and Camille Aron
Author(s): Manuel I. Díaz, Jong E. Han, and Camille Aron

Motivated by the resistive switchings in transition-metal oxides (TMOs) induced by a voltage bias, we study the far-from-equilibrium dynamics of an electric-field-driven strongly correlated model featuring a first-order insulator-to-metal transition at equilibrium, namely the dimer-Hubbard model. We…

[Phys. Rev. B 107, 195148] Published Wed May 24, 2023

Nonlinear density waves on graphene electron fluids
Pedro Cosme and Hugo Terças
Author(s): Pedro Cosme and Hugo Terças

The hydrodynamic behavior of charged carriers leads to nonlinear phenomena such as solitary waves and shocks, among others. As an application, such waves might be exploited on plasmonic devices either for modulation or signal propagation along graphene waveguides. We study the nature of nonlinear pe…

[Phys. Rev. B 107, 195432] Published Wed May 24, 2023

Probing elastic properties of graphene and heat conduction in graphene bubbles above $1000{\phantom{\rule{0.16em}{0ex}}}^{∘}\mathrm{C}$
Wolfgang Bacsa, Frédéric Topin, Marc Miscevic, James M. Hill, Yuan Huang, and Rodney S. Ruoff
Author(s): Wolfgang Bacsa, Frédéric Topin, Marc Miscevic, James M. Hill, Yuan Huang, and Rodney S. Ruoff

The elastic and thermal properties of graphene were investigated by illuminating graphen bubbles with a laser spot. Tempertures above $1000{\phantom{\rule{0.16em}{0ex}}}^{∘}\mathrm{C}$ were obtained in large ($>10\phantom{\rule{0.28em}{0ex}}µ\mathrm{m}$) graphene bubbles. The formation of standin…

[Phys. Rev. B 107, 195433] Published Wed May 24, 2023

Collective excitations of the Chern-insulator states in commensurate double moiré superlattices of twisted bilayer graphene on hexagonal boron nitride
Xianqing Lin, Quan Zhou, Cheng Li, and Jun Ni
Author(s): Xianqing Lin, Quan Zhou, Cheng Li, and Jun Ni

We study the collective excitation modes of the Chern insulator states in magic-angle twisted bilayer graphene aligned with hexagonal boron nitride (TBG/BN) at odd integer fillings ($ν$) of the flat bands. For the $1×1$ commensurate double moiré superlattices in TBG/BN at three twist angles (${θ}^{′…

[Phys. Rev. B 107, 195434] Published Wed May 24, 2023

Effectuating tunable valley selection via multiterminal monolayer graphene devices
Shrushti Tapar and Bhaskaran Muralidharan
Author(s): Shrushti Tapar and Bhaskaran Muralidharan

Valleytronics using two-dimensional materials opens unprecedented opportunities for information processing using a valley polarizer as a basic building block. Various methodologies, such as strain engineering, the inclusion of line defects, and the application of static magnetic fields, have been wi…

[Phys. Rev. B 107, 205415] Published Wed May 24, 2023

Born approximation study of the strong disorder in magnetized surface states of a topological insulator
R. S. Akzyanov
Author(s): R. S. Akzyanov

In this study, we investigate the effect of random point disorder on the surface states of a topological insulator with out-of-plane magnetization. We consider the disorder within a high-order Born approximation. The Born series converges to the one branch of the self-consistent Born approximation (…

[Phys. Rev. B 107, 205416] Published Wed May 24, 2023

Found 1 papers in prl
Date of feed: Thu, 25 May 2023 03:17:15 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]+)

Comment on “Coulomb Instabilities of a Three-Dimensional Higher-Order Topological Insulator”
Yu-Wen Lee and Min-Fong Yang
Author(s): Yu-Wen Lee and Min-Fong Yang
[Phys. Rev. Lett. 130, 219701] Published Wed May 24, 2023

Found 2 papers in pr_res
Date of feed: Thu, 25 May 2023 03:17:12 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]+)

Resonant helicity mixing of electromagnetic waves propagating through matter
Jon Lasa-Alonso, Jorge Olmos-Trigo, Chiara Devescovi, Pilar Hernández, Aitzol García-Etxarri, and Gabriel Molina-Terriza
Author(s): Jon Lasa-Alonso, Jorge Olmos-Trigo, Chiara Devescovi, Pilar Hernández, Aitzol García-Etxarri, and Gabriel Molina-Terriza

Dual scatterers preserve the helicity of an incident field, whereas antidual scatterers flip it completely. In this setting of linear electromagnetic scattering theory, we provide a completely general proof on the nonexistence of passive antidual scatterers. However, we show that scatterers fulfilli…

[Phys. Rev. Research 5, 023116] Published Wed May 24, 2023

Topological magnetoelectric effect in semiconductor nanostructures: Quantum wells, wires, dots, and rings
Josep Planelles, Jose L. Movilla, and Juan I. Climente
Author(s): Josep Planelles, Jose L. Movilla, and Juan I. Climente

Electrostatic charges placed near the interface between ordinary and topological insulators induce magnetic fields through the so-called topological magnetoelectric effect. Here we present a numerical implementation of the associated Maxwell equations. The resulting model is simple, fast, and quanti…

[Phys. Rev. Research 5, 023119] Published Wed May 24, 2023

Found 1 papers in nano-lett
Date of feed: Wed, 24 May 2023 21:02:52 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]+)

[ASAP] Experimental Demonstration of a Magnetically Induced Warping Transition in a Topological Insulator Mediated by Rare-Earth Surface Dopants
Beatriz Muñiz Cano, Yago Ferreiros, Pierre A. Pantaleón, Ji Dai, Massimo Tallarida, Adriana I. Figueroa, Vera Marinova, Kevin García-Díez, Aitor Mugarza, Sergio O. Valenzuela, Rodolfo Miranda, Julio Camarero, Francisco Guinea, Jose Angel Silva-Guillén, and Miguel A. Valbuena

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Nano Letters
DOI: 10.1021/acs.nanolett.3c00587

Found 1 papers in acs-nano
Date of feed: Thu, 25 May 2023 00:39:58 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]+)

[ASAP] Portable Bulk-Water Disinfection by Live Capture of Bacteria with Divergently Branched Porous Graphite in Electric Fields
Xianfu Luo, Weigu Li, Zexi Liang, Yifei Liu, and Donglei Emma Fan

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.2c12229

Found 1 papers in science-adv
Date of feed: Wed, 24 May 2023 19:00:09 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]+)

Higher-order topological polariton corner state lasing
Jinqi Wu, Sanjib Ghosh, Yusong Gan, Ying Shi, Subhaskar Mandal, Handong Sun, Baile Zhang, Timothy C. H. Liew, Rui Su, Qihua Xiong
Science Advances, Volume 9, Issue 21, May 2023.

Found 3 papers in nat-comm

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]+)

Topological defects reveal the plasticity of glasses
< author missing >

Rotational and dilational reconstruction in transition metal dichalcogenide moiré bilayers
< author missing >

Topology of vibrational modes predicts plastic events in glasses
< author missing >

Found 1 papers in scipost

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]+)

Symmetries and topological operators, on average, by Andrea Antinucci, Giovanni Galati, Giovanni Rizi and Marco Serone
< author missing >
Submitted on 2023-05-24, refereeing deadline 2023-06-21.