Found 44 papers in cond-mat


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Coherent Modulation of Two-Dimensional Moir\'e States with On-Chip THz Waves
Yiliu Li, Eric A. Arsenault, Birui Yang, Xi Wang, Heonjoon Park, Yinjie Guo, Takashi Taniguchi, Kenji Watanabe, Daniel Gamelin, James C. Hone, Cory R. Dean, Sebastian F. Maehrlein, Xiaodong Xu, Xiaoyang Zhu
arXiv:2403.17974v1 Announce Type: new Abstract: Van der Waals (vdW) structures of two-dimensional materials host a broad range of physical phenomena. New opportunities arise if different functional layers may be remotely modulated or coupled in a device structure. Here we demonstrate the in-situ coherent modulation of moir\'e excitons and correlated Mott insulators in transition metal dichalcogenide (TMD) homo- or hetero-bilayers with on-chip terahertz (THz) waves. Using common dual-gated device structures, each consisting of a TMD moir\'e bilayer sandwiched between two few-layer graphene (fl-Gr) gates with hexagonal boron nitride (h-BN) spacers, we launch coherent phonon wavepackets at ~0.4-1 THz from the fl-Gr gates by femtosecond laser excitation. The waves travel through the h-BN spacer, arrive at the TMD bilayer with precise timing, and coherently modulate the moir\'e excitons or the Mott states. These results demonstrate that the fl-Gr gates, often used for electrical control of the material properties, can serve as effective on-chip opto-elastic transducers to generate THz waves for the coherent control and vibrational entanglement of functional layers in commonly used moir\'e devices.

Electro-optic properties from ab initio calculations in two-dimensional materials
Zhijun Jiang, Hongjun Xiang, Laurent Bellaiche, Charles Paillard
arXiv:2403.17987v1 Announce Type: new Abstract: Electro-optic (EO) effects relate the change of optical constants by low-frequency electric fields. Thanks to the advent of Density Functional Perturbation Theory (DFPT), the EO properties of bulk three-dimensional (3D) materials can now be calculated in an ab initio way. However, the use of periodic boundary conditions in most Density Functional Theory codes imposes to simulate two-dimensional (2D) materials using slabs surrounded by a large layer of vacuum. The EO coefficients predicted from such calculations, if not rescaled properly, can severely deviate from the real EO properties of 2D materials. The present work discusses the issue and introduces the rescaling relationships allowing to recover the true EO properties.

Observation of nodal-arcs, effect of axial strain on the nodal-lines & Weyl nodes and low-temperature finite value of Seebeck coefficient in TaAs class of Weyl semimetals
Vivek Pandey, Sudhir K. Pandey
arXiv:2403.18169v1 Announce Type: new Abstract: This work verifies the SOC-induced evolution of \textit{nodal-arcs} into Weyl nodes under the effect of spin-orbit coupling (SOC) in NbAs \& NbP. The obtained features mimics the observations as reported for TaAs \& TaP in our previous work\cite{pandey2023existence}. In addition, this work reports that the number of nodes in TaAs class of Weyl semimetals (WSMs) can be altered via creating strain along $a$ or $c$ direction of the crystal. For instance, the number of nodes in NbAs under SOC-effect along with 2\% (3\%) compressive-strain in $a$ direction is found to be 20 (28). Besides the nodes, such strain are found to have considerable impact on the nodal-rings of these WSMs when effect of SOC is ignored. Apart from this, the work discusses the role of Weyl physics in affecting the Seebeck coefficient of any WSM. In this direction, it is discussed that how a symmetric Weyl cone, even if tilted, have no contribution to the Seebeck of WSMs. Furthermore, the work highlights the conditions under which a Weyl cone can contribute to the Seebeck coefficient of a given WSM. Lastly, the discussion of Weyl contribution to Seebeck is validated over TaAs class of WSMs via investigating the features of its Weyl cones and calculating the contributions of these cones to the Seebeck coefficient of these semimetals. The value of $S$ contributed from Weyl cone is found to be as large as $\sim$65 $\mu$\textit{V}/\textit{K} below 25 K in case of TaAs. The findings of this work present a possibility of engineering the topological properties of TaAs class of WSMs via creating strain in their crystal. It also makes the picture of Weyl physics\textquoteright\hspace{0.1cm} impact on the Seebeck coefficient of WSMs a more clear.

Interfacial magnetic spin Hall effect in van der Waals Fe3GeTe2/MoTe2 heterostructure
Yudi Dai, Junlin Xiong, Yanfeng Ge, Bin Cheng, Lizheng Wang, Pengfei Wang, Zenglin Liu, Shengnan Yan, Cuiwei Zhang, Xianghan Xu, Youguo Shi, Sang-Wook Cheong, Cong Xiao, Shengyuan A. Yang, Shi-Jun Liang, Feng Miao
arXiv:2403.18189v1 Announce Type: new Abstract: The spin Hall effect (SHE) allows efficient generation of spin polarization or spin current through charge current and plays a crucial role in the development of spintronics. While SHE typically occurs in non-magnetic materials and is time-reversal even, exploring time-reversal-odd (T-odd) SHE, which couples SHE to magnetization in ferromagnetic materials, offers a new charge-spin conversion mechanism with new functionalities. Here, we report the observation of giant T-odd SHE in Fe3GeTe2/MoTe2 van der Waals heterostructure, representing a previously unidentified interfacial magnetic spin Hall effect (interfacial-MSHE). Through rigorous symmetry analysis and theoretical calculations, we attribute the interfacial-MSHE to a symmetry-breaking induced spin current dipole at the vdW interface. Furthermore, we show that this linear effect can be used for implementing multiply-accumulate operations and binary convolutional neural networks with cascaded multi-terminal devices. Our findings uncover an interfacial T-odd charge-spin conversion mechanism with promising potential for energy-efficient in-memory computing.

Next-Generation Time-Resolved Scanning Probe Microscopy
Katsuya Iwaya, Hiroyuki Mogi, Shoji Yoshida, Yusuke Arashida, Osamu Takeuchi, Hidemi Shigekawa
arXiv:2403.18215v1 Announce Type: new Abstract: Understanding the nanoscale carrier dynamics induced by light excitation is the key to unlocking futuristic devices and innovative functionalities in advanced materials. Optical pump-probe scanning tunneling microscopy (OPP-STM) has opened a window to these phenomena. However, mastering the combination of ultrafast pulsed lasers with STM requires high expertise and effort. We have shattered this barrier and developed a compact OPP-STM system accessible to all. This system precisely controls laser pulse timing electrically and enables stable laser irradiation on sample surfaces. Furthermore, by applying this technique to atomic force microscopy (AFM), we have captured time-resolved force signals with an exceptionally high signal-to-noise ratio. Originating from the dipole-dipole interactions, these signals provide insights into the carrier dynamics on sample surfaces, which are activated by photo-illumination. These technologies are promising as powerful tools for exploring a wide range of photoinduced phenomena in conductive and insulating materials.

Phonons in stringlet-land and the boson peak
Cunyuan Jiang, Matteo Baggioli
arXiv:2403.18221v1 Announce Type: new Abstract: Solid materials that deviate from the harmonic crystal paradigm exhibit characteristic anomalies in the specific heat and vibrational density of states (VDOS) with respect to Debye's theory predictions. The boson peak (BP), a low-frequency excess in the VDOS over Debye law $g(\omega) \propto \omega^2$, is certainly the most famous among them; nevertheless, its origin is still subject of fierce debate. Recent simulation works provided strong evidence that localized one-dimensional string-like excitations (stringlets) might be the microscopic origin of the BP. In this work, we study the dynamics of acoustic phonons interacting with a bath of vibrating 1D stringlets with exponentially distributed size, as observed in simulations. We show that stringlets strongly renormalize the phonon propagator and naturally induce a BP anomaly in the vibrational density of states, corresponding to the emergence of a dispersionless BP flat mode. Additionally, phonon-stringlet interactions produce a strong enhancement of sound attenuation and a dip in the speed of sound near the BP frequency, consistent with experimental and simulation data. The qualitative trends of the BP frequency and intensity are predicted within the model and shown to be in good agreement with previous observations. In summary, our results substantiate with a simple theoretical model the recent simulation results by Hu and Tanaka claiming the origin of the BP from stringlet dynamics.

Evidence for conventional superconductivity in Bi$_2$PdPt and prediction of topological superconductivity in disorder-free $\gamma$-BiPd
S. Sharma, A. D. S. Richards, Sajilesh K. P., A. Kataria, B. S. Agboola, M. Pula, J. Gautreau, A. Ghara, D. Singh, S. Marik, S. R. Dunsiger, M. J. Lagos, A. Kanigel, E. S. S{\o}rensen, R. P. Singh, G. M. Luke
arXiv:2403.18244v1 Announce Type: new Abstract: We present comprehensive investigations into the structural, superconducting, and topological properties of Bi$_2$PdPt. Magnetization and heat capacity measurements performed on polycrystalline Bi$_2$PdPt demonstrate a superconducting transition at $\approx$ 0.8 K. Moreover, muon spin relaxation/rotation ($\mu$SR) measurements present evidence for a time reversal symmetry preserving, isotropically gapped superconducting state in Bi$_2$PdPt. We have also performed density-functional theory (DFT) calculations on Bi$_2$PdPt alongside the more general isostructural systems, BiPd$_{x}$Pt$_{1-x}$, of which Bi$_2$PdPt and $\gamma$-BiPd are special cases for $x=0.5$ and $x=1$ respectively. We have calculated the $Z_2$ topological index from our DFT calculations for a range of substitution fractions, $x$, between $x=0$ and $x=1$ characterizing the topology of the band structure. We find a non-trivial topological state when $x>0.75$ and a trivial topological state when $x<0.75$. Therefore our results indicate that BiPd$_{x}$Pt$_{1-x}$ could be a topological superconductor for $x>0.75$.

Non-Hermitian Topology with Generalized Chiral Symmetry
Alex Weststr\"om, Wenbu Duan, Jian Li
arXiv:2403.18268v1 Announce Type: new Abstract: We study a generalization of chiral symmetry applicable to non-Hermitian systems and its topological consequences on one-dimensional chains. We uncover a rich family of topological phases hosting several chiral flavors characterized not by a single winding number, but a vector of of them. This, in turn, leads to a novel type of bulk-boundary correspondence, where -- in contrast with conventional chiral chains -- some flavors can have topologically stable non-zero charges on both ends. Moreover, we find that the total charge of each flavor can in some cases exceed the magnitude of the highest winding number in the vector invariant. Our work extends the topological classification of the non-Hermitian AIII class along a new axis.

Bulk-entanglement-spectrum correspondence in $PT$- and $PC$-symmetric topological insulators
Ryo Takahashi, Tomoki Ozawa
arXiv:2403.18372v1 Announce Type: new Abstract: In this study, we discuss a new type of bulk-boundary correspondence which holds for topological insulators when the parity-time ($PT$) and/or parity-particle-hole ($PC$) symmetry are present. In these systems, even when the bulk topology is nontrivial, the edge spectrum is generally gapped, and thus the conventional bulk-boundary correspondence does not hold. We find that, instead of the edge spectrum, the single-particle entanglement spectrum becomes gapless when the bulk topology is nontrivial: i.e., the {\it bulk-entanglement-spectrum correspondence} holds in $PT$- and/or $PC$-symmetric topological insulators. After showing the correspondence using $K$-theoretic approach, we provide concrete models for each symmetry class up to three dimensions where nontrivial topology due to $PT$ and/or $PC$ is expected. An implication of our results is that, when the bulk topology under $PT$ and/or $PC$ symmetry is nontrivial, the many-body entanglement spectrum is multiply degenerate in one dimension and is gapless in two or higher dimensions.

Unraveling the collinearity in short-range order parameters for lattice configurations arising from topological constraints
Abhijit Chatterjee
arXiv:2403.18380v1 Announce Type: new Abstract: In multicomponent lattice problems, e.g., in alloys, and at crystalline surfaces and interfaces, atomic arrangements exhibit spatial correlations that dictate the kinetic and thermodynamic phase behavior. These correlations emerge from interparticle interactions and are frequently reported in terms of the short-range order (SRO) parameter. Expressed usually in terms of pair distributions and other cluster probabilities, the SRO parameter gives the likelihood of finding atoms/molecules of a particular type in the vicinity of others atoms. This study focuses on fundamental constraints involving the SRO parameters that are imposed by the underlying lattice topology. Using a data-driven approach, we uncover the interrelationships between different SRO parameters (e.g., pairs, triplets, quadruplets, etc.) on a lattice. The main finding is that while some SRO parameters are independent, the remaining are collinear, i.e., the latter are dictated by the independent ones through linear relationships. A kinetic and thermodynamic modeling framework based on these constraints is introduced.

$J_{eff}$ states in a quasi one dimensional antiferromagnetic spin chain hexagonal Iridates Sr$_3$MIrO$_6$ (M=Mg, Zn, Cd): an $ab-initio$ comparative perspective
Roumita Roy, Sudipta Kanungo
arXiv:2403.18408v1 Announce Type: new Abstract: We employ first-principles density-functional theory, to perform a comparative investigation of the effect of the spin-orbit coupling (SOC) on the electronic and magnetic properties of three experimentally synthesized and characterized hexagonal perovskites Sr$_3$MIrO$_6$(M=Mg, Zn, Cd). The electronic structure calculations show that in all the compounds, Ir is the only magnetically active site in +4[5$d^5$] configuration, whereas M$^{+2}$ (M=Cd, Zn, Mg), remains in nonmagnetic states with Cd/Zn and Mg featuring $d^{10}$ and $d^{0}$ electronic configurations, respectively. The insulating gap could be opened by switching on the correlation parameter $U$ for Sr$_3$CdrO$_6$ and Sr$_3$ZnIrO$_6$ which qualifies it to be a correlated Mott insulator. However, in the case of Sr$_3$MgIrO$_6$ both $U$ and antiferromagnetic ordering is not enough and the gap could only be opened by including the SOC which classifies it to fall under the category of a typical SOC Mott insulator. The $j_{eff}$ states are visualized from the orbital projected band structure. The magnetism is studied from the point of view of exchange interactions and magnetocrystalline anisotropy in the presence of the SOC. We also present the comparative analysis of the renormalized impact of SOC on the three compounds, which shows that all the three compounds fall under the $intermediate$ coupling regime, where Sr$_3$MgIrO$_6$ is comparatively closer to the atomic $j_{eff}=\frac{1}{2}$ picture from the others.

Generalized bulk-boundary correspondence in periodically driven non-Hermitian systems
Xiang Ji, Xiaosen Yang
arXiv:2403.18470v1 Announce Type: new Abstract: We present a pedagogical review of the periodically driven non-Hermitian systems, particularly on the rich interplay between the non-Hermitian skin effect and the topology. We start by reviewing the non-Bloch band theory of the static non-Hermitian systems and discuss the establishment of its generalized bulk-boundary correspondence. Ultimately, we focus on the non-Bloch band theory of two typical periodically driven non-Hermitian systems: harmonically driven non-Hermitian system and periodically quenched non-Hermitian system. The non-Bloch topological invariants were defined on the generalized Brillouin zone and the real space wave functions to characterize the Floquet non-Hermtian topological phases. Then, the generalized bulk-boundary correspondence was established for the two typical periodically driven non-Hermitian systems. Additionally, we review novel phenomena in the higher-dimensional periodically driven non-Hermitian systems, including Floquet non-Hermitian higher-order topological phases and Floquet hybrid skin-topological modes. The experimental realizations and recent advances have also been surveyed. Finally, we end with a summarization and hope this pedagogical review can motivate further research on Floquet non-Hermtian topological physics.

Rashba spin splitting-induced topological Hall effect in a Dirac semimetal-ferromagnetic semiconductor heterostructure
Saurav Islam, Emma Steinebronn, Kaijie Yang, Bimal Neupane, Juan Chamorro, Supriya Ghosh, K. Andre Mkhoyan, Tyrel M. McQueen, Yuanxi Wang, Chaoxing Liu, Nitin Samarth
arXiv:2403.18485v1 Announce Type: new Abstract: We use a concerted theory-experiment effort to investigate the formation of chiral real space spin texture when the archetypal Dirac semimetal Cd$_3$As$_2$ is interfaced with In$_{1-x}$Mn$_x$As, a ferromagnetic semiconductor with perpendicular magnetic anisotropy. Our calculations reveal a nonzero off-diagonal spin susceptibility in the Cd$_3$As$_2$ layer due to the Rashba spin-orbit coupling from broken inversion symmetry. This implies the presence of a Dzyaloshinskii-Moriya interaction between local moments in the In$_{1-x}$Mn$_x$As layer, mediated by Dirac electrons in the vicinal Cd$_3$As$_2$ layer, potentially creating the conditions for a real space chiral spin texture. Using electrical magnetoresistance measurements at low temperature, we observe an emergent excess contribution to the transverse magneto-resistance whose behavior is consistent with a topological Hall effect arising from the formation of an interfacial chiral spin texture. This excess Hall voltage varies with gate voltage, indicating a promising electrostatically-tunable platform for understanding the interplay between the helical momentum space states of a Dirac semimetal and chiral real space spin textures in a ferromagnet.

Anomalous terahertz photoconductivity caused by the superballistic flow of hydrodynamic electrons in graphene
M. Kravtsov, A. L. Shilov, Y. Yang, T. Pryadilin, M. A. Kashchenko, O. Popova, M. Titova, D. Voropaev, Y. Wang, K. Shein, I. Gayduchenko, G. N. Goltsman, M. Lukianov, A. Kudriashov, T. Taniguchi, K. Watanabe, D. A. Svintsov, A. Principi, S. Adam, K. S. Novoselov, D. A. Bandurin
arXiv:2403.18492v1 Announce Type: new Abstract: Light incident upon materials can induce changes in their electrical conductivity, a phenomenon referred to as photoresistance. In semiconductors, the photoresistance is negative, as light-induced promotion of electrons across the band gap enhances the number of charge carriers participating in transport. In superconductors, the photoresistance is positive because of the destruction of the superconducting state, whereas in normal metals it is vanishing. Here we report a qualitative deviation from the standard behavior in metallic graphene. We show that Dirac electrons exposed to continuous wave (CW) terahertz (THz) radiation can be thermally decoupled from the lattice by 50~K which activates hydrodynamic electron transport. In this regime, the resistance of graphene constrictions experiences a decrease caused by the THz-driven superballistic flow of correlated electrons. We analyze the dependencies of the negative photoresistance on the carrier density, and the radiation power and show that our superballistic devices operate as sensitive phonon-cooled bolometers and can thus offer a picosecond-scale response time. Beyond their fundamental implications, our findings underscore the practicality of electron hydrodynamics in designing ultra-fast THz sensors and electron thermometers.

Octahedral and polar phase transitions in freestanding films of SrTiO3
Ludmila Leroy, Shih-Wen Huang, Chun-Chien Chiu, Sheng-Zhu Ho, Janine D\"ossegger, Cinthia Piamonteze, Elsa Abreu, Alessandro Bombardi, Jan-Chi Yang, Urs Staub
arXiv:2403.18577v1 Announce Type: new Abstract: From extreme strain to bending, the possibilities in the manipulation of freestanding films of oxide perovskites bring a novel landscape to their properties and brings them one step closer to their application. It is therefore of great importance to fully understand the inherent properties of such films, in which dimensionality and surface effects can play a major role in defining the properties of the materials ground state. This paper reports the properties of freestanding (FS) films of the canonical oxide, SrTiO3 (STO) with thicknesses 20, 30, 40 and 80 nm. We show that the relaxed ultrathin STO FS films become polar at temperatures as high as 85 K, in contrast to the quantum paraelectric behavior of bulk. Our findings are based on the softening of the ferroelectric mode towards the ferroelectric transition temperature Tc and its consecutive hardening below Tc with further decreasing temperature, probed with THz time domain spectroscopy in transmission mode. We find almost no thickness dependence in Tc. Moreover, we characterize the antiferrodistortive (AFD) phase transition in STO FS by X-ray diffraction (XRD) probing superlattice reflections characteristic for the rotation of the TiO6 octahedra. Our results point to a higher phase transition temperature in comparison to bulk STO, as well as an unbalanced domain population favoring the rotation axis to be in plane. X-ray linear dichroism results further show a preferential Ti xz/yz orbital occupancy at the surface, but with a complete degeneracy in the t2g states in the inner part of the film indicating that the AFD distortion does not strongly affect the t2g splitting. These findings demonstrate that STO FS films have clearly different properties than bulk.

Random Apollonian networks with tailored clustering coefficient
Eduardo M. K. Souza, Guilherme M. A. Almeida
arXiv:2403.18615v1 Announce Type: new Abstract: We introduce a family of complex networks that interpolates between the Apollonian network and its binary version, recently introduced in [Phys. Rev. E \textbf{107}, 024305 (2023)], via random removal of nodes. The dilution process allows the clustering coefficient to vary from $C=0.828$ to $C=0$ while maintaining the behavior of average path length and other relevant quantities as in the deterministic Apollonian network. Robustness against the random deletion of nodes is also reported on spectral quantities such as the ground-state localization degree and its energy gap to the first excited state. The loss of the $2\pi / 3$ rotation symmetry as a tree-like network emerges is investigated in the light of the hub wavefunction amplitude. Our findings expose the interplay between the small-world property and other distinctive traits exhibited by Apollonian networks, as well as their resilience against random attacks.

Exploring the Berezinskii-Kosterlitz-Thouless Transition in a Two-dimensional Dipolar Bose Gas
Yifei He, Ziting Chen, Haoting Zhen, Mingchen Huang, Mithilesh K Parit, Gyu-Boong Jo
arXiv:2403.18683v1 Announce Type: new Abstract: Long-range and anisotropic dipolar interactions induce complex order in quantum systems. It becomes particularly interesting in two-dimension (2D), where the superfluidity with quasi-long-range order emerges via Berezinskii-Kosterlitz-Thouless (BKT) mechanism, which still remains elusive with dipolar interactions. Here, we observe the BKT transition from a normal gas to the superfluid phase in a quasi-2D dipolar Bose gas of erbium atoms. Controlling the orientation of dipoles, we characterize the transition point by monitoring extended coherence and measuring the equation of state. This allows us to gain a systematic understanding of the BKT transition based on an effective short-range description of dipolar interaction in 2D. Additionally, we observe anisotropic density fluctuations and non-local effects in the superfluid regime, which establishes the dipolar nature of the 2D superfluid. Our results lay the ground for understanding the behavior of dipolar bosons in 2D and open up opportunities for examining complex orders in a dipolar superfluid.

Hydroflux-Controlled Growth of Magnetic K-Cu-Te-O(H) Phases
Allana G. Iwanicki (Department of Chemistry, Johns Hopkins University, Institute for Quantum Matter, William H. Miller III Department of Physics and Astronomy, Johns Hopkins University), Brandon Wilfong (Department of Chemistry, Johns Hopkins University, Institute for Quantum Matter, William H. Miller III Department of Physics and Astronomy, Johns Hopkins University), Eli Zoghlin (Institute for Quantum Matter, William H. Miller III Department of Physics and Astronomy, Johns Hopkins University), Wyatt Bunstine (Institute for Quantum Matter, William H. Miller III Department of Physics and Astronomy, Johns Hopkins University), Maxime A. Siegler (Department of Chemistry, Johns Hopkins University), Tyrel M. McQueen (Department of Chemistry, Johns Hopkins University, Department of Materials Science and Engineering, Johns Hopkins University)
arXiv:2403.18726v1 Announce Type: new Abstract: Innovative synthetic approaches can yield new phases containing novel structural and magnetic motifs. In this work, we show the synthesis and magnetic characterization of three new and one previously reported layered phase in the K-Cu-Te-O(H) phase space using a tunable hydroflux technique. The hydroflux, with a roughly equal molar ratio of water and alkali hydroxide, is a highly oxidizing, low melting solvent which can be used to isolate metastable phases unattainable through traditional solid state or flux techniques. The newly synthesized phases, K$_{2}$Cu$_{2}$TeO$_{6}$, K$_{2}$Cu$_{2}$TeO$_{6}$ $\cdot$ H$_{2}$O, and K$_{6}$Cu$_{9}$Te$_{4}$O$_{24}$ $\cdot$ 2 H$_{2}$O, contain Cu$^{2+}$ within CuO$_{4}$ square planar plaquettes and TeO$_{6}$ octahedra ordering to form structural honeycomb layers isolated by interlayer K$^{+}$ ions and H$_{2}$O molecules. We find the synthesized structures display varying tilt sequences of the CuO$_{4}$ plaquettes, leading to distinct Cu$^{2+}$ magnetic motifs on the structural honeycomb lattice and a range of effective magnetic dimensionalities. We find that K$_{2}$Cu$_{2}$TeO$_{6}$ $\cdot$ H$_{2}$O does not order and displays alternating chain Heisenberg antiferromagnetic (AFM) behavior, while K$_{2}$Cu$_{2}$TeO$_{6}$ and K$_{6}$Cu$_{9}$Te$_{4}$O$_{24}$ $\cdot$ 2 H$_{2}$O order antiferromagnetically (T$_{N}$ = 100 K and T$_{N}$ = 6.5 K respectively). The previously known phase, K$_{2}$CuTeO$_{4}$(OH)$_{2}$ $\cdot$ H$_{2}$O, we find contains structurally and magnetically one-dimensional CuO$_{4}$ plaquettes leading to uniform chain Heisenberg AFM behavior and shows no magnetic order down to T = 0.4 K. We discuss and highlight the usefulness of the hydroflux technique in novel syntheses and the interesting magnetic motifs that arise in these particular phases.

Full counting statistics of 1d short-range Riesz gases in confinement
J. Kethepalli, M. Kulkarni, A. Kundu, S. N. Majumdar, D. Mukamel, G. Schehr
arXiv:2403.18750v1 Announce Type: new Abstract: We investigate the full counting statistics (FCS) of a harmonically confined 1d short-range Riesz gas consisting of $N$ particles in equilibrium at finite temperature. The particles interact with each other through a repulsive power-law interaction with an exponent $k>1$ which includes the Calogero-Moser model for $k=2$. We examine the probability distribution of the number of particles in a finite domain $[-W, W]$ called number distribution, denoted by $\mathcal{N}(W, N)$. We analyze the probability distribution of $\mathcal{N}(W, N)$ and show that it exhibits a large deviation form for large $N$ characterised by a speed $N^{\frac{3k+2}{k+2}}$ and by a large deviation function of the fraction $c = \mathcal{N}(W, N)/N$ of the particles inside the domain and $W$. We show that the density profiles that create the large deviations display interesting shape transitions as one varies $c$ and $W$. This is manifested by a third-order phase transition exhibited by the large deviation function that has discontinuous third derivatives. Monte-Carlo (MC) simulations show good agreement with our analytical expressions for the corresponding density profiles. We find that the typical fluctuations of $\mathcal{N}(W, N)$, obtained from our field theoretic calculations are Gaussian distributed with a variance that scales as $N^{\nu_k}$, with $\nu_k = (2-k)/(2+k)$. We also present some numerical findings on the mean and the variance. Furthermore, we adapt our formalism to study the index distribution (where the domain is semi-infinite $(-\infty, W])$, linear statistics (the variance), thermodynamic pressure and bulk modulus.

Structure and thermodynamics of supported lipid membranes on hydrophobic van der Waals surfaces
H. Read, S. Benaglia, L. Fumagalli
arXiv:2403.18786v1 Announce Type: new Abstract: Understanding the adsorption and physical characteristics of supported lipid membranes is crucial for their effective use as model cell membranes. Their morphological and thermodynamic properties at the nanoscale have traditionally been studied on hydrophilic substrates, such as mica and silicon oxide, which have proved to facilitate the reconstruction of biomembranes. However, in more recent years, with the advent of the van der Waals crystals technology, two-dimensional crystals such as graphene have been proposed as potential substrates in biosensing devices. Membranes formed on these crystals are expected to behave differently owing to their intrinsic hydrophobicity, however thus far knowledge of their morphological and thermodynamic properties is lacking. Here we present a comprehensive nanoscale analysis of the adsorption of phosphatidylcholine lipid monolayers on two of the most commonly used van der Waals crystals, graphite and hexagonal boron nitride. Both morphological and thermodynamic properties of the lipid membranes were investigated using temperature-controlled atomic force microscopy. Our experiments show that the lipids adsorb onto the crystals, forming monolayers with their orientation dependent upon their concentration. Furthermore, we found that the hydrophobicity of van der Waals crystals determines a strong increase in the transition temperature of the lipid monolayer compared to that observed on hydrophilic substrates. These results are important for understanding the properties of lipid membranes at solid surfaces and extending their use to novel drug delivery and biosensing devices made of van der Waals crystals.

Signatures of electronic ordering in transport in graphene flat bands
Archisman Panigrahi, Leonid Levitov
arXiv:2403.18817v1 Announce Type: new Abstract: Recently, a wide family of electronic orders was unveiled in graphene flat bands, such as spin- and valley-polarized phases as well as nematic momentum-polarized phases, stabilized by exchange interactions via a generalized Stoner mechanism. Momentum polarization involves orbital degrees of freedom and is therefore expected to impact resistivity in a way which is uniquely sensitive to the ordering type. Under pocket polarization, carrier distribution shifts in k space and samples the band mass in regions defined by the displaced momentum distribution. This makes transport coefficients sensitive to pocket polarization, resulting in the ohmic resistivity decreasing with temperature. In addition, it leads to current switching and hysteresis under strong E field. This behavior remains robust in the presence of electron-phonon scattering and is therefore expected to be generic.

Band engineering and study of disorder using topology in compact high kinetic inductance cavity arrays
Vincent Jouanny, Simone Frasca, Vera Jo Weibel, Leo Peyruchat, Marco Scigliuzzo, Fabian Oppliger, Franco De Palma, Davide Sbroggio, Guillaume Beaulieu, Oded Zilberberg, Pasquale Scarlino
arXiv:2403.18150v1 Announce Type: cross Abstract: Superconducting microwave metamaterials offer enormous potential for quantum optics and information science, enabling the development of advanced quantum technologies for sensing and amplification. In the context of circuit quantum electrodynamics, such metamaterials can be implemented as coupled cavity arrays (CCAs). In the continuous effort to miniaturize quantum devices for increasing scalability, minimizing the footprint of CCAs while preserving low disorder becomes paramount. In this work, we present a compact CCA architecture leveraging superconducting NbN thin films presenting high kinetic inductance, which enables high-impedance CCA ($\sim1.5$ k$\Omega$), while reducing the resonator footprint. We demonstrate its versatility and scalability by engineering one-dimensional CCAs with up to 100 resonators and exhibiting multiple bandgaps. Additionally, we quantitatively investigate disorder in the CCAs using symmetry-protected topological SSH modes, from which we extract a resonator frequency scattering of $0.22^{+0.04}_{-0.03}\%$. Our platform opens up exciting new prospects for analog quantum simulations of many-body physics with ultrastrongly coupled emitters.

Flows in the Space of Interacting Chiral Boson Theories
Stephen Ebert, Christian Ferko, Cian Luke Martin, Gabriele Tartaglino-Mazzucchelli
arXiv:2403.18242v1 Announce Type: cross Abstract: We study interacting theories of $N$ left-moving and $\overline{N}$ right-moving Floreanini-Jackiw bosons in two dimensions. A parameterized family of such theories is shown to enjoy (non-manifest) Lorentz invariance if and only if its Lagrangian obeys a flow equation driven by a function of the energy-momentum tensor. We discuss the canonical quantization of such theories along classical stress tensor flows, focusing on the case of the root-$T \overline{T}$ deformation, where we obtain perturbative results for the deformed spectrum in a certain large-momentum limit. In the special case $N = \overline{N}$, we consider the quantum effective action for the root-$T \overline{T}$-deformed theory by expanding around a general classical background, and we find that the one-loop contribution vanishes for backgrounds with constant scalar gradients. Our analysis can also be interpreted via dual $U(1)$ Chern-Simons theories in three dimensions, which might be used to describe deformations of charged $\mathrm{AdS}_3$ black holes or quantum Hall systems.

THz probing of non-trivial topological states in Co2MnGe Heusler alloy thin films
Ekta Yadav, Anand Nivedan, Sunil Kumar
arXiv:2403.18332v1 Announce Type: cross Abstract: Co2MnGe (CMG) has been demonstrated recently as a half-metallic ferromagnetic Heusler alloy which possesses a topologically non-trivial band structure. This behavior is unique to such systems and hence warrants extensive experimental exploration for potential spintronic and chirality sensitive optoelectonic applications. Here, we demonstrate that an epitaxial thin film of CMG acts as a source of THz radiation upon photoexcitation by optical femtosecond laser pulses. Detailed experiments have revealed that a large contribution to THz emission occurs due to nonmagnetic or spin-independent origin, however, significant contribution in the THz generation is evidenced through excitation light helicity dependent circular photogalvanic effect (CPGE) confirming the presence of topologically non-trivial carriers. Furthermore, we show that not only the topological contribution is easily suppressed but also the overall THz generation efficiency is also affected adversely for the epitaxial films grown at high substrate temperatures.

Full quantitative near-field characterization of strongly coupled exciton-plasmon polaritons in thin-layered WSe2 on a monocrystalline gold platelet
Laura N. Casses, Binbin Zhou, Qiaoling Lin, Annie Tan, Diane-Pernille Bendixen-Fernex de Mongex, Korbinian J. Kaltenecker, Sanshui Xiao, Martijn Wubs, Nicolas Stenger
arXiv:2403.18655v1 Announce Type: cross Abstract: Exciton-plasmon polaritons (EPPs) are attractive both for the exploration of fundamental phenomena and applications in nanophotonics. Previous studies of EPPs mainly relied on far-field characterization. Here, using near-field optical microscopy, we quantitatively characterize the dispersion of EPPs existing in 13-nm-thick tungsten diselenide (WSe$_2$) deposited on a monocrystalline gold platelet. We extract from our experimental data a Rabi splitting of 81 meV, and an experimental effective polariton loss of 55 meV, demonstrating that our system is in the strong-coupling regime. Furthermore, we measure for the first time at visible wavelengths the propagation length of these EPPs for each excitation energy of the dispersion relation. To demonstrate the quantitative nature of our near-field method to obtain the full complex-valued wavevector of EPPs, we use our near-field measurements to predict, via the transfer matrix method, the far-field reflectivities across the exciton resonance. These predictions are in excellent agreement with our experimental far-field measurements. Our findings open the door towards the full near-field study of light-manipulating devices at the nanoscale.

Unidirectional Ray Polaritons in Twisted Asymmetric Stacks
J. \'Alvarez-Cuervo, M. Obst, S. Dixit, G. Carini, A. I. F. Tresguerres-Mata, C. Lanza, E. Ter\'an-Garc\'ia, G. \'Alvarez-P\'erez, L. Fern\'andez-\'Alvarez, K. Diaz-Granados, R. Kowalski, A. S. Senerath, N. S. Mueller, L. Herrer, J. M. De Teresa, S. Wasserroth, J. M. Klopf, T. Beechem, M. Wolf, L. M. Eng, T. G. Folland, A. Tarazaga Mart\'in-Luengo, J. Mart\'in-S\'anchez, S. C. Kehr, A. Y. Nikitin, J. D. Caldwell, P. Alonso-Gonz\'alez, A. Paarmann
arXiv:2403.18657v1 Announce Type: cross Abstract: The emergence of a vast repository of van der Waals (vdW) materials supporting polaritons - light coupled to matter excitations - offers a plethora of different possibilities to tailor electromagnetic waves at the subwavelength-scale. In particular, the development of twistoptics - the study of the optical properties of twisted stacks of vdW materials - allows the directional propagation of phonon polaritons (PhPs) along a single spatial direction, which has been coined as canalization. Here we demonstrate a complementary type of nanoscale unidirectional propagation that naturally emerges thanks to twistoptics: unidirectional ray polaritons (URPs). This natural phenomenon arises in two types of twisted hyperbolic stacks: homostructures of $\alpha$-MoO$_3$ and heterostructures of $\alpha$-MoO$_3$ and $\beta$-Ga$_2$O$_3$, each with very different thicknesses of its constituents. URPs are characterized by the absence of diffraction and the presence of a single phase of the propagating field. Importantly, we demonstrate that this ray behavior can be tuned by means of both relative twist angle and illumination frequency variations. Additionally, an unprecedented "pinwheel-like" propagation emerges at specific twist angles of the homostructure. We show that URPs emerge due to the twist between asymmetrically stacked biaxial slabs, while the shear effect in monoclinic $\beta$-Ga$_2$O$_3$ is of minor importance. Our findings demonstrate a natural way to excite unidirectional ray-like PhPs and offer a unique platform for controlling the propagation of PhPs at the nanoscale with many potential applications like nanoimaging, (bio)-sensing or polaritonic thermal management.

Physical and unphysical regimes of self-consistent many-body perturbation theory
K. Van Houcke, E. Kozik, R. Rossi, Y. Deng, F. Werner
arXiv:2102.04508v2 Announce Type: replace Abstract: In the standard framework of self-consistent many-body perturbation theory, the skeleton series for the self-energy is truncated at a finite order $\mathcal{N}$ and plugged into the Dyson equation, which is then solved for the propagator $G_{\mathcal{N}}\,$. We consider two examples of fermionic models, the Hubbard atom at half filling and its zero space-time dimensional simplified version. First, we show that $G_{\mathcal{N}}\,$ converges when $\mathcal{N}\to\infty$ to a limit $G_\infty\,$, which coincides with the exact physical propagator $G_{\rm exact}\ $ at small enough coupling, while $G_\infty \neq G_{\rm exact}\ $ at strong coupling. This follows from the findings of [Kozik, Ferrero and Georges, PRL 114, 156402 (2015)] and an additional subtle mathematical mechanism elucidated here. Second, we demonstrate that it is possible to discriminate between the $G_\infty=G_{\rm exact}\ $ and $G_\infty\neq G_{\rm exact}\ $ regimes thanks to a criterion which does not require the knowledge of $G_{\rm exact}\ $, as proposed in [Rossi et al., PRB 93, 161102(R) (2016)].

Role of the Berry curvature on BCS-type superconductivity in two-dimensional materials
Florian Simon, Louis Pagot, Marc Gabay, Mark O. Goerbig
arXiv:2209.07287v2 Announce Type: replace Abstract: We theoretically investigate how the Berry curvature, which arises in multi-band structures when the electrons can be described by an effective single-band Hamiltonian, affects the superconducting properties of two-dimensional electronic systems. Generically the Berry curvature is coupled to electric fields beyond those created by the periodic crystal potential. A potential source of such electric fields, which vary slowly on the lattice scale, is the mutual interaction between the electrons. We show that the Berry curvature provides additional terms in the Hamiltonian describing interacting electrons within a single band. When these terms are taken into account in the framework of the usual BCS weak-coupling treatment of a generic attractive interaction that allows for the formation of Cooper pairs, the coupling constant is modified. In pure singlet and triplet superconductors, we find that the Berry curvature generally lowers the coupling constant and thus the superconducting gap and the critical temperature as a function of doping. From an experimental point of view, a measured deviation from the expected BCS critical temperature upon doping, e.g. in doped two-dimensional transition-metal dichalcogenides, may unveil the strength of the Berry curvature.

Depth-dependent magnetic crossover in a room-temperature skyrmion-hosting multilayer
T. J. Hicken, M. N. Wilson, Z. Salman, S. L. Zhang, S. J. R. Holt, T. Prokscha, A. Suter, F. L. Pratt, G. van der Laan, T. Hesjedal, T. Lancaster
arXiv:2210.06070v2 Announce Type: replace Abstract: Skyrmion-hosting multilayer stacks are promising avenues for applications, although little is known about the depth dependence of the magnetism. We address this by reporting the results of circular dichroic resonant elastic x-ray scattering (CD-REXS), micromagnetic simulations, and low-energy muon-spin rotation (LE-$\mu^+$SR) measurements on a stack comprising [Ta/CoFeB/MgO]$_{16}$/Ta on a Si substrate. Energy-dependent CD-REXS shows a continuous, monotonic evolution of the domain-wall helicity angle with incident energy, consistent with a three-dimensional hybrid domain-wall-like structure that changes from N\'eel-like near the surface to Bloch-like deeper within the sample. LE-$\mu^+$SR reveals that the magnetic field distribution in the trilayers near the surface of the stack is distinct from that in trilayers deeper within the sample. Our micromagnetic simulations support a quantitative analysis of the $\mu^+$SR results. By increasing the applied magnetic field, we find a reduction in the volume occupied by domain walls at all depths, consistent with a crossover into a region dominated by skyrmions above approximately 180 mT.

Topological superconductivity induced by spin-orbit coupling, perpendicular magnetic field and superlattice potential
Jonathan Schirmer, J. K. Jain, C. -X. Liu
arXiv:2211.15001v2 Announce Type: replace Abstract: Topological superconductors support Majorana modes, which are quasiparticles that are their own antiparticles and which obey non-Abelian statistics in which successive exchanges of particles do not always commute. Here we investigate whether a two-dimensional superconductor with ordinary s-wave pairing can be rendered topological by the application of a strong magnetic field. To address this, we obtain the self-consistent solutions to the mean field Bogoliubov-de Gennes equations, which are a large set of nonlinearly coupled equations, for electrons moving on a lattice. We find that the topological "quantum Hall superconductivity" is facilitated by a combination of spin-orbit coupling, which locks an electron's spin to its momentum as it moves through a material, and a coupling to an external periodic potential which gives a dispersion to the Landau levels and also distorts the Abrikosov lattice. We find that, for a range of parameters, the Landau levels broadened by the external periodic potential support topological superconductivity, which is typically accompanied by a lattice of "giant" $h/e$ vortices as opposed to the familiar lattice of $h/2e$ Abrikosov vortices. In the presence of a periodic potential, we find it necessary to use an ansatz for the pairing potential of the form $\Delta(\vec{r})e^{i2\vec{Q}\cdot\vec{r}}$ where $\Delta(\vec{r})$ has a periodicity commensurate with the periodic potential. However, despite this form of the pairing potential, the current in the ground state is zero. In the region of ordinary superconductivity, we typically find a lattice of dimers of $h/2e$ vortices. Our work suggests a realistic proposal for achieving topological superconductivity, as well as a helical order parameter and unusual Abrikosov lattices.

Topological heavy fermions in magnetic field
Keshav Singh, Aaron Chew, Jonah Herzog-Arbeitman, B. Andrei Bernevig, Oskar Vafek
arXiv:2305.08171v2 Announce Type: replace Abstract: The recently introduced topological heavy fermion model (THFM) provides a means for interpreting the low-energy electronic degrees of freedom of the magic angle twisted bilayer graphene as hybridization amidst highly dispersing topological conduction and weakly dispersing localized heavy fermions. In order to understand the Landau quantization of the ensuing electronic spectrum, a generalization of THFM to include the magnetic field B is desired, but currently missing. Here we provide a systematic derivation of the THFM in B and solve the resulting model to obtain the interacting Hofstadter spectra for single particle charged excitations. While naive minimal substitution within THFM fails to correctly account for the total number of magnetic subbands within the narrow band i.e. its total Chern number, our method -- based on projecting the light and heavy fermions onto the irreducible representations of the magnetic translation group -- reproduces the correct total Chern number. Analytical results presented here offer an intuitive understanding of the nature of the (strongly interacting) Hofstadter bands.

Electronic Structure and Vibrational Stability of Copper-substituted Lead Apatite (LK-99)
J. Cabezas-Escares, N. F. Barrera, R. H. Lavroff, A. N. Alexandrova, C. Cardenas, F. Munoz
arXiv:2308.01135v4 Announce Type: replace Abstract: Two recent preprints in the physics archive (arXiv) have called attention as they claim experimental evidence that a Cu-substituted apatite material (dubbed LK-99) exhibits superconductivity at room temperature and pressure. If this proves to be true, LK-99 will be a ``holy grail" of superconductors. In this work, we used Density Functional Theory (DFT+U) calculations to elucidate some key features of the electronic structure of LK-99. We find two different phases of this material: (i) a hexagonal lattice featuring metallic half-filled and spin-split bands, a nesting of the Fermi surface, a remarkably large electron-phonon coupling, but this lattice is vibrationally unstable. (ii) a triclinic lattice, with the Cu and surrounding O distorted. This lattice is vibrationally stable and its bands correspond to an insulator. In a crystal, the Cu atoms should oscillate between equivalent triclinic positions, with an average close to the hexagonal positions. We discuss the electronic structure expected from these fluctuations and if it is compatible with superconductivity.

Emulating moir\'e materials with quasiperiodic circuit quantum electrodynamics
Tobias Herrig, Christina Koliofoti, Jedediah H. Pixley, Elio J. K\"onig, Roman-Pascal Riwar
arXiv:2310.15103v2 Announce Type: replace Abstract: Topological bandstructures interfering with moir\'e superstructures give rise to a plethora of emergent phenomena, which are pivotal for correlated insulating and superconducting states of twisttronics materials. While quasiperiodicity was up to now a notion mostly reserved for solid-state materials and cold atoms, we here demonstrate the capacity of conventional superconducting circuits to emulate moir\'e physics in charge space. With two examples, we show that Hofstadter's butterfly and the magic-angle effect, are directly visible in spectroscopic transport measurements. Importantly, these features survive in the presence of harmonic trapping potentials due to parasitic linear capacitances. Our proposed platform benefits from unprecedented tuning capabilities, and opens the door to probe incommensurate physics in virtually any spatial dimension.

Superconductivity in a layered cobalt oxychalcogenide Na$_{2}$CoSe$_{2}$O with a triangular lattice
Jingwen Cheng, Jianli Bai, Binbin Ruan, Pinyu Liu, Yu Huang, Qingxin Dong, Yifei Huang, Yingrui Sun, Cundong Li, Libo Zhang, Qiaoyu Liu, Wenliang Zhu, Zhian Ren, Genfu Chen
arXiv:2310.17464v2 Announce Type: replace Abstract: Unconventional superconductivity in bulk materials under ambient pressure is extremely rare among the 3d transition metal compounds outside the layered cuprates and iron-based family. It is predominantly linked to highly anisotropic electronic properties and quasi-two-dimensional (2D) Fermi surfaces. To date, the only known example of a Co-based exotic superconductor is the hydrated layered cobaltate, Na$_{x}$CoO$_{2}\cdot$ yH$_{2}$O, and its superconductivity is realized in the vicinity of a spin-1/2 Mott state. However, the nature of the superconductivity in these materials is still a subject of intense debate, and therefore, finding a new class of superconductors will help unravel the mysteries of their unconventional superconductivity. Here we report the discovery of superconductivity at $\sim$ 6.3 K in our newly synthesized layered compound Na$_{2}$CoSe$_{2}$O, in which the edge-shared CoSe$_{6}$ octahedra form [CoSe$_{2}$] layers with a perfect triangular lattice of Co ions. It is the first 3d transition metal oxychalcogenide superconductor with distinct structural and chemical characteristics. Despite its relatively low $T_{c}$, this material exhibits very high superconducting upper critical fields, $\mu_{0}H_{c2}(0)$, which far exceeds the Pauli paramagnetic limit by a factor of 3 - 4. First-principles calculations show that Na$_{2}$CoSe$_{2}$O is a rare example of a negative charge transfer superconductor. This cobalt oxychalcogenide with a geometrical frustration among Co spins shows great potential as a highly appealing candidate for the realization of unconventional and/or high-$T_{c}$ superconductivity beyond the well-established Cu- and Fe-based superconductor families and opens a new field in the physics and chemistry of low-dimensional superconductors.

Topological Orders Beyond Topological Quantum Field Theories
P. Vojta, G. Ortiz, Z. Nussinov
arXiv:2311.03353v3 Announce Type: replace Abstract: Systems displaying quantum topological order feature robust characteristics that are very attractive to quantum computing schemes. Topological quantum field theories have proven to be powerful in capturing the quintessential attributes of systems displaying topological order including, in particular, their anyon excitations. Here, we investigate systems that lie outside this common purview, and present a rich class of models exhibiting topological orders with distance-dependent interacting anyons. As we illustrate, in some instances, the gapped lowest-energy excitations are comprised of anyons that densely cover the entire system. This leads to behaviors not typically described by topological quantum field theories. We examine these models by performing dualities to systems displaying conventional (i.e., Landau) orders. Our approach enables a general method for mapping generic Landau-type theories to dual models with topological order of the same spatial dimension. The low-energy subspaces of our models can be made more resilient to thermal effects than those of surface codes.

When correlations exceed system size: finite-size scaling in free boundary conditions above the upper critical dimension
Yu. Honchar, B. Berche, Yu. Holovatch, R. Kenna
arXiv:2311.11721v2 Announce Type: replace Abstract: We progress finite-size scaling in systems with free boundary conditions above their upper critical dimension, where in the thermodynamic limit critical scaling is described by mean-field theory. Recent works show that the correlation length is not bound by the system's physical size, a belief that long held sway. Instead, two scaling regimes can be observed - at the critical and pseudo-critical temperatures. We demonstrate that both are manifest for free boundaries. We use numerical simulations of the $d=5$ Ising model to analyse the magnetization, susceptibility, magnetization Fourier modes and the partition function zeros. While some of the response functions hide the dual finite-size scaling, the precision enabled by the analysis of Lee-Yang zeros allows this be brought to the fore. In particular, finite-size scaling of leading zeros at the pseudo-critical point confirms recent predictions coming from correlations exceeding the system size. This paper is dedicated to Jaroslav Ilnytskyi on the occasion of his 60th birthday.

Non-Hermitian second-order topological superconductors
Xaing Ji, Wenchen Ding, Yuanping Chen, Xiaosen Yang
arXiv:2311.18325v2 Announce Type: replace Abstract: The topology of non-Hermitian systems is fundamentally changed by the non-Hermitian skin effect, which leads to the generalized bulk-boundary correspondence. Based on the non-Bloch band theory, we get insight into the interplay between the non-Hermiticity and the second-order topological superconductors in two spatial dimensions. We investigate that the non-Hermiticity drives both the bulk states and topological edge modes to accumulate toward opposite corners of the system depending on the particle and hole degrees of freedom protected by the particle-hole symmetry. Furthermore, the degeneracy of the Majorana corner modes can be broken in terms of both the eigenenergies and the eigenstates. Through an edge theory analysis, we elucidate the impact of non-Hermiticity and enable the extension of higher-order topological superconductors to the realm of non-Hermitian systems. We show that $Z_2$ skin effect and $Z_2$ skin-topological modes reveal the universal characteristics of non-Hermitian second-order topological superconductors and the generalized bulk-boundary correspondence is further enriched by the particle-hole symmetry.

On the Adequacy of the Dynamical Mean Field Theory for Low Density and Dirac Materials
Anqi Mu, Zhiyuan Sun, Andrew J. Millis
arXiv:2312.11693v2 Announce Type: replace Abstract: The qualitative reliability of the dynamical mean field theory (DMFT) is investigated for systems in which either the actual carrier density or the effective carrier density is low, by comparing the exact perturbative and dynamical mean field expressions of electron scattering rates and optical conductivities. We study two interacting systems: tight binding models in which the chemical potential is near a band edge and Dirac systems in which the chemical potential is near the Dirac point. In both systems it is found that DMFT underestimates the low frequency, near-Fermi surface single particle scattering rate by a factor proportional to the particle density. The quasiparticle effective mass is qualitatively incorrect for the low density tight binding model but not necessarily for Dirac systems. The dissipative part of the optical conductivity is more subtle: in the exact calculation vertex corrections, typically neglected in DMFT calculations, suppress the low frequency optical absorption, compensating for some of the DMFT underestimate of the scattering rate. The role of vertex corrections in calculating the conductivity for Dirac systems is clarified and a systematic discussion is given of the approach to the Galilean/Lorentz invariant low density limit. Relevance to recent calculations related to Weyl metals is discussed.

Tip-induced creation and Jahn-Teller distortions of sulfur vacancies in single-layer MoS$_{2}$
Daniel Jansen, Tfyeche Tounsi, Jeison Fischer, Arkady V. Krasheninnikov, Thomas Michely, Hannu-Pekka Komsa, Wouter Jolie
arXiv:2401.09931v2 Announce Type: replace Abstract: We present an atomically precise technique to create sulfur vacancies and control their atomic configurations in single-layer MoS$_{2}$. It involves adsorbed Fe atoms and the tip of a scanning tunneling microscope, which enables single sulfur removal from the top sulfur layer at the initial position of Fe. Using scanning tunneling spectroscopy, we show that the STM tip can also induce two Jahn-Teller distorted states with reduced orbital symmetry in the sulfur vacancies. Density functional theory calculations rationalize our experimental results. Additionally, we provide evidence for molecule-like hybrid orbitals in artificially created sulfur vacancy dimers, which illustrates the potential of our technique for the development of extended defect lattices and tailored electronic band structures.

Electrostatic control of nonlinear photonic-crystal polaritons in a monolayer semiconductor
Ekaterina Khestanova, Vanik Shahnazaryan, Valerii K. Kozin, Valeriy I. Kondratyev, Dmitry N. Krizhanovskii, Maurice S. Skolnick, Ivan A. Shelykh, Ivan V. Iorsh, Vasily Kravtsov
arXiv:2402.16193v2 Announce Type: replace Abstract: Integration of 2D semiconductors with photonic crystal slabs provides an attractive approach to achieve strong light--matter coupling and exciton-polariton formation in a planar chip-compatible geometry. However, for the development of practical devices, it is crucial that the polariton excitations in the structure are easily tunable and exhibit strong nonlinear response. Here we study neutral and charged exciton-polaritons in an electrostatically gated planar photonic crystal slab with an embedded monolayer semiconductor MoSe$_2$ and experimentally demonstrate strong polariton nonlinearity, which can be tuned via gate voltage. We find that modulation of dielectric environment within the photonic crystal results in the formation of two distinct resonances with significantly different nonlinear response, which enables optical switching with ultrashort laser pulses. Our results open new avenues towards development of active polaritonic devices in a compact chip-compatible implementation.

Topological Boundary Modes in Nonlinear Dynamics with Chiral Symmetry
Di Zhou
arXiv:2403.12480v2 Announce Type: replace Abstract: Particle-hole symmetry and chiral symmetry play a pivotal role in multiple areas of physics, yet they remain unstudied in systems with nonlinear interactions whose nonlinear normal modes do not exhibit $\textbf{U}(1)$-gauge symmetry. In this work, we establish particle-hole symmetry and chiral symmetry in such systems. Chiral symmetry ensures the quantization of the Berry phase of nonlinear normal modes and categorizes the topological phases of nonlinear dynamics. We show topologically protected static boundary modes in chiral-symmetric nonlinear systems. Our theoretical framework extends particle-hole and chiral symmetries to nonlinear dynamics, whose nonlinear modes do not necessarily yield $\textbf{U}(1)$-gauge symmetry.

Electronic instability, layer selectivity and Fermi arcs in La$_3$Ni$_2$O$_7$
Frank Lechermann, Steffen B\"otzel, Ilya M. Eremin
arXiv:2403.12831v2 Announce Type: replace Abstract: Using advanced dynamical mean-field theory on a realistic level we study the normal-state correlated electronic structure of the high-pressure superconductor La$_3$Ni$_2$O$_7$ and compare the features of the conventional bilayer (2222) Ruddelsden-Popper crystal structure with those of a newly-identified monolayer-trilayer (1313) alternation. Both structural cases display Ni-$d_{z^2}$ flat-band character at low-energy, which drives an electronic instability with a wave vector ${\bf q_{\rm I}}=(0.25,0.25,q_z)$ at ambient pressure, in line with recent experimental findings. The 1313 electronic structure exhibits significant layer selectivity, rendering especially the monolayer part to be Mott-critical. At high pressure, this layer selectivity weakens and the 1313 fermiology displays arcs reminiscent to those of high-$T_c$ cuprates. In contrast to dominant inter-site self-energy effects in the latter systems, here the Fermi arcs are the result of the multiorbital and multilayer interplay within a correlated flat-band scenario.

Viscoelastic wetting: Cox-Voinov theory with normal stress effects
Minkush Kansal, Vincent Bertin, Charu Datt, Jens Eggers, Jacco H. Snoeijer
arXiv:2310.11114v2 Announce Type: replace-cross Abstract: The classical Cox-Voinov theory of contact line motion provides a relation between the macroscopically observable contact angle, and the microscopic wetting angle as a function of contact line velocity. Here we investigate how viscoelasticity, specifically the normal stress effect, modifies wetting dynamics. Using the thin film equation for the second-order fluid, it is found that the normal stress effect is dominant at small scales. We show that the effect can be incorporated in the Cox-Voinov theory through an apparent microscopic angle, which differs from the true microscopic angle. The theory is applied to the classical problems of drop spreading and dip-coating, which shows how normal stress facilitates (inhibits) the motion of advancing (receding) contact lines. For rapid advancing motion, the apparent microscopic angle can tend to zero in which case the dynamics is described by a new regime that was already anticipated in Boudaoud (2007).

Sampling reduced density matrix to extract fine levels of entanglement spectrum
Bin-Bin Mao, Yi-Ming Ding, Zheng Yan
arXiv:2310.16709v2 Announce Type: replace-cross Abstract: Low-lying entanglement spectrum provides the quintessential fingerprint to identify the highly entangled quantum matter with topological and conformal field-theoretical properties. However, when the entangling region acquires long boundary with the environment, such as that between long coupled chains or in two or higher dimensions, there unfortunately exists no universal yet practical method to compute the entanglement spectra with affordable computational cost. Here we propose a new scheme to overcome such difficulty and successfully extract the low-lying fine entanglement spectrum (ES). We trace out the environment via quantum Monte Carlo simulation and diagonalize the reduced density matrix to gain the ES. We demonstrate the strength and reliability of our method through long coupled spin chains and answer its long-standing controversy. Our simulation results, with unprecedentedly large system sizes, establish the practical computation scheme of the entanglement spectrum with a huge freedom degree of environment.

Found 10 papers in prb
Date of feed: Thu, 28 Mar 2024 04:17:11 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)

Anomalous dynamical response of non-Hermitian topological phases
Ritu Nehra and Dibyendu Roy
Author(s): Ritu Nehra and Dibyendu Roy

Composite topological phases with intriguing topology like Möbius strips emerge in sublattice symmetric non-Hermitian systems due to spontaneous breaking of time-reversal symmetry at some parameter regime. While these phases have been characterized by nonadiabatic complex geometric phases of multipl…


[Phys. Rev. B 109, 094311] Published Wed Mar 27, 2024

Insights into the origin of the first sharp diffraction peak in amorphous silica from an analysis of chemical and radial ordering
Parthapratim Biswas, Devilal Dahal, and Stephen R. Elliott
Author(s): Parthapratim Biswas, Devilal Dahal, and Stephen R. Elliott

The structural origin of the first sharp diffraction peak (FSDP) in amorphous silica is studied by analyzing chemical and radial ordering of silicon (Si) and oxygen (O) atoms in binary amorphous networks. The study shows that the chemical order involving Si–O and O–O pairs play a major role in the f…


[Phys. Rev. B 109, 104207] Published Wed Mar 27, 2024

Magnetic field induced phases and spin Hamiltonian in ${\mathrm{Cs}}_{2}{\mathrm{CoBr}}_{4}$
L. Facheris, S. D. Nabi, K. Yu. Povarov, Z. Yan, A. Glezer Moshe, U. Nagel, T. Rõõm, A. Podlesnyak, E. Ressouche, K. Beauvois, J. R. Stewart, P. Manuel, D. Khalyavin, F. Orlandi, and A. Zheludev
Author(s): L. Facheris, S. D. Nabi, K. Yu. Povarov, Z. Yan, A. Glezer Moshe, U. Nagel, T. Rõõm, A. Podlesnyak, E. Ressouche, K. Beauvois, J. R. Stewart, P. Manuel, D. Khalyavin, F. Orlandi, and A. Zheludev

Geometric frustration, magnetic anisotropy, and reduced dimensionality are responsible for the plethora of magnetic phases observed in the quantum antiferromagnet Cs2CoB4. Among them are a commensurate magnetization plateau, a longitudinal spin density wave, and an incommensurate spin-fan structure. Even more unusual is the excitation spectrum. It is an hierarchy of successive bound states of fractional kink quasiparticles. To understand this rich physics, one has to know the spin Hamiltonian, and that can only be determined in high-field spectroscopic measurements.


[Phys. Rev. B 109, 104433] Published Wed Mar 27, 2024

Symmetry determined topology from flux dimerization
Gang Jiang, Z. Y. Chen, S. J. Yue, W. B. Rui, Xiao-Ming Zhu, Shengyuan A. Yang, and Y. X. Zhao
Author(s): Gang Jiang, Z. Y. Chen, S. J. Yue, W. B. Rui, Xiao-Ming Zhu, Shengyuan A. Yang, and Y. X. Zhao

In the field of symmetry-protected topological phases, a common wisdom is that the symmetries may fix the nontrivial topological classifications, but they alone cannot determine whether a system is topologically nontrivial. Here, we show that this is no longer true in cases where symmetries are proj…


[Phys. Rev. B 109, 115155] Published Wed Mar 27, 2024

Manipulating Fermi arc surface states for nonlinear nonreciprocal transport in Weyl semimetals
K. X. Jia, R. Ma, H. Geng, L. Sheng, and D. Y. Xing
Author(s): K. X. Jia, R. Ma, H. Geng, L. Sheng, and D. Y. Xing

In this work, the realization of nonreciprocal transport in Weyl semimetals is proposed by manipulating surface states. Our method, distinct from traditional techniques focusing on bulk band asymmetry, involves surface asymmetries characterized by an asymmetric mass term. Utilizing the Boltzmann tra…


[Phys. Rev. B 109, 115306] Published Wed Mar 27, 2024

Strain-induced valley transport in a ${\mathrm{CrBr}}_{3}/{\mathrm{WSe}}_{2}/{\mathrm{CrBr}}_{3}$ van der Waals heterostructure
David Soriano, Damiano Marian, Prabhat Dubey, and Gianluca Fiori
Author(s): David Soriano, Damiano Marian, Prabhat Dubey, and Gianluca Fiori

Two-dimensional magnetic materials are at the forefront of the next generation of spintronic devices. The possibility to interface them with other van der Waals materials such as transition metal dichalcogenides has opened new possibilities for the observation of new and existing physical phenomena.…


[Phys. Rev. B 109, 115434] Published Wed Mar 27, 2024

Erratum: Many-body exchange-correlation effects in ${\mathrm{MoS}}_{2}$ monolayer: The key role of nonlocal dielectric screening [Phys. Rev. B 102, 085425 (2020)]
A. Faridi and Reza Asgari
Author(s): A. Faridi and Reza Asgari
[Phys. Rev. B 109, 119904] Published Wed Mar 27, 2024

Inhomogeneous and nonlocal optical response in magic-angle twisted trilayer graphene
Chao Ding, Yueheng Du, and Mingwen Zhao
Author(s): Chao Ding, Yueheng Du, and Mingwen Zhao

The response of traditional two-dimensional (2D) materials to electromagnetic fields is typically homogeneous and local, as the wavelength of the electromagnetic field is much longer than the lattice constant of 2D materials. In contrast, plasmons in moiré flatband systems enable the coupling of ele…


[Phys. Rev. B 109, 125431] Published Wed Mar 27, 2024

Dual semi-Dirac cones in three-dimensional photonic crystals
Mingyan Li, Ran Mei, Dongyang Yan, Zhikai Ma, Fang Cao, Yadong Xu, Changqing Xu, and Jie Luo
Author(s): Mingyan Li, Ran Mei, Dongyang Yan, Zhikai Ma, Fang Cao, Yadong Xu, Changqing Xu, and Jie Luo

Semi-Dirac cones, characterized by linear-parabolic dispersions, endow photonic crystals with many fascinating properties, such as topological transitions and anisotropic electromagnetic responses. While most preceding investigations concentrated on two-dimensional systems, our exploration of three-…


[Phys. Rev. B 109, 125432] Published Wed Mar 27, 2024

Coexistence of topological and normal insulating phases in electro-optically tuned InAs/GaSb bilayer quantum wells
M. Meyer, T. Fähndrich, S. Schmid, A. Wolf, S. S. Krishtopenko, B. Jouault, G. Bastard, F. Teppe, F. Hartmann, and S. Höfling
Author(s): M. Meyer, T. Fähndrich, S. Schmid, A. Wolf, S. S. Krishtopenko, B. Jouault, G. Bastard, F. Teppe, F. Hartmann, and S. Höfling

Topological insulators (TIs) based on InAs/GaSb bilayer quantum wells are appealing due to the electric field tuning between topological and normal insulating (NI) phases. Here, the authors report on the coexistence of NI and TI phases in electro-optically tuned InAs/GaSb bilayer quantum wells and helical edge channels in the bulk of the sample. These findings pave the way to the manipulation and utilization of helical edge channels by using spatially defined gates (optically or electrically), separating them from the physical edges.


[Phys. Rev. B 109, L121303] Published Wed Mar 27, 2024

Found 3 papers in prl
Date of feed: Thu, 28 Mar 2024 04:17:10 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)

Three-Dimensional Topological Field Theories and Nonunitary Minimal Models
Dongmin Gang, Heeyeon Kim, and Spencer Stubbs
Author(s): Dongmin Gang, Heeyeon Kim, and Spencer Stubbs

We find an intriguing relation between a class of three-dimensional nonunitary topological field theories (TFTs) and Virasoro minimal models $M(2,2r+3)$ with $r≥1$. The TFTs are constructed by topologically twisting 3D $\mathcal{N}=4$ superconformal field theories (SCFTs) of rank-0, i.e., having zer…


[Phys. Rev. Lett. 132, 131601] Published Wed Mar 27, 2024

Terminable Transitions in a Topological Fermionic Ladder
Yuchi He, Dante M. Kennes, Christoph Karrasch, and Roman Rausch
Author(s): Yuchi He, Dante M. Kennes, Christoph Karrasch, and Roman Rausch

Interacting fermionic ladders are versatile platforms to study quantum phases of matter, such as different types of Mott insulators. In particular, there are D-Mott and S-Mott states that hold preformed fermion pairs and become paired-fermion liquids upon doping ($d$ wave and $s$ wave, respectively)…


[Phys. Rev. Lett. 132, 136501] Published Wed Mar 27, 2024

Full Classification of Transport on an Equilibrated $5/2$ Edge via Shot Noise
Sourav Manna, Ankur Das, Moshe Goldstein, and Yuval Gefen
Author(s): Sourav Manna, Ankur Das, Moshe Goldstein, and Yuval Gefen

A new protocol shows promise for classifying non-Abelian fractional quantum Hall states–being explored for quantum computation–using experimental shot-noise techniques.


[Phys. Rev. Lett. 132, 136502] Published Wed Mar 27, 2024

Found 1 papers in prx
Date of feed: Thu, 28 Mar 2024 04:17:09 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Fragility of Surface States in Non-Wigner-Dyson Topological Insulators
Alexander Altland, Piet W. Brouwer, Johannes Dieplinger, Matthew S. Foster, Mateo Moreno-Gonzalez, and Luka Trifunovic
Author(s): Alexander Altland, Piet W. Brouwer, Johannes Dieplinger, Matthew S. Foster, Mateo Moreno-Gonzalez, and Luka Trifunovic

In some topological states of matter, a surface-bulk connection called spectral flow underpins many of the material’s unusual properties. A new analysis, however, shows that most 3D topological phases do not actually possess spectral flow.


[Phys. Rev. X 14, 011057] Published Wed Mar 27, 2024

Found 1 papers in pr_res
Date of feed: Thu, 28 Mar 2024 04:17:09 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Defect-populated configurations in nematic solid tori and cylinders
Javier Rojo-González, Livio Nicola Carenza, Alexis de la Cotte, Ludwig A. Hoffmann, Luca Giomi, and Alberto Fernandez-Nieves
Author(s): Javier Rojo-González, Livio Nicola Carenza, Alexis de la Cotte, Ludwig A. Hoffmann, Luca Giomi, and Alberto Fernandez-Nieves

Nematic solid tori subject to tangential anchoring feature defect structures despite not being topologically required. Their metastability results from the presence of energy barriers accounting for the bulk rearrangement that would be required for the nematic to transition from defect-populated to defect-free states.


[Phys. Rev. Research 6, L012065] Published Wed Mar 27, 2024

Found 1 papers in science-adv
Date of feed: Wed, 27 Mar 2024 19:09:24 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)

Atom-by-atom imaging of moiré transformations in 2D transition metal dichalcogenides
Yichao Zhang, Ji-Hwan Baek, Chia-Hao Lee, Yeonjoon Jung, Seong Chul Hong, Gillian Nolan, Kenji Watanabe, Takashi Taniguchi, Gwan-Hyoung Lee, Pinshane Y. Huang
Science Advances, Volume 10, Issue 13, March 2024.

Found 2 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Topological photonic band gaps in honeycomb atomic arrays, by Pierre Wulles, Sergey E. Skipetrov
< author missing >
Submitted on 2024-03-27, refereeing deadline 2024-04-25.

A higher-order topological twist on cold-atom SO($5$) Dirac fields, by Alejandro Bermudez, Daniel González-Cuadra, Simon Hands
< author missing >
Submitted on 2024-03-27, refereeing deadline 2024-04-10.

Found 1 papers in small
Date of feed: Wed, 27 Mar 2024 07:39:30 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)

Bayesian Optimization of Environmentally Sustainable Graphene Inks Produced by Wet Jet Milling
Lindsay E. Chaney, Anton van Beek, Julia R. Downing, Jinrui Zhang, Hengrui Zhang, Janan Hui, E. Alexander Sorensen, Maryam Khalaj, Jennifer B. Dunn, Wei Chen, Mark C. Hersam
Small, EarlyView.

Found 3 papers in adv-mater
Date of feed: Wed, 27 Mar 2024 07:30:53 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)

Topological Quantum Switching enabled Neuroelectronic Synaptic Modulators for Brain Computer Interface
Dani S. Assi, Hongli Huang, Vaithinathan Karthikeyan, Vaskuri C. S. Theja, Maria Merlyne de Souza, Vellaisamy A. L. Roy
Advanced Materials, Accepted Article.

Moiré Pattern Controlled Phonon Polarizer Based on Twisted Graphene
Zihao Qin, Lingyun Dai, Man Li, Suixuan Li, Huan Wu, Katherine E. White, Gilad Gani, Paul S. Weiss, Yongjie Hu
Advanced Materials, EarlyView.

Sub‐Diffraction Correlation of Quantum Emitters and Local Strain Fields in Strain‐Engineered WSe2 Monolayers
David D. Xu, Albert F. Vong, M. Iqbal Bakti Utama, Dmitry Lebedev, Riddhi Ananth, Mark C. Hersam, Emily A. Weiss, Chad A. Mirkin
Advanced Materials, EarlyView.