Found 27 papers in cond-mat
Date of feed: Fri, 01 Sep 2023 00:30:00 GMT

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Thermodynamics and fractal dynamics of nematic spin ice, a doubly frustrated pyrochlore Ising magnet. (arXiv:2308.16234v1 [cond-mat.str-el])
Jonathan N. Hallén, Claudio Castelnovo, Roderich Moessner

The Ising antiferromagnets on the triangular and on the pyrochlore lattices are two of the most iconic examples of magnetic frustration, paradigmatically illustrating many exotic properties such as emergent gauge fields, fractionalisation, and topological order. In this work, we show that the two instances of frustration can, remarkably, be combined in a single system, where they coexist without inducing conventional long range ordering. We show that the system undergoes a first order phase transition upon lowering the temperature, into a yet different frustrated phase that we characterise to exhibit nematic order. We argue that an extensive degeneracy survives down to zero temperature, at odds with a customary Pauling estimate. Dynamically, we find evidence of anomalous noise in the power spectral density, arising from an effectively anisotropic fractal motion of monopoles at low temperature.

Ultrafast Field-driven Valley Polarization of Transition Metal Dichalcogenide Quantum Dots. (arXiv:2308.16315v1 [cond-mat.mes-hall])
Aranyo Mitra, Ahmal Jawad Zafar, Vadym Apalkov

We study theoretically the electron dynamics of transition metal dichalcogenide quantum dots in the field of an ultrashort and ultrafast circularly polarized optical pulse. The quantum dots have the shape of a disk and their electron systems are described within an effective model with infinite mass boundary conditions. Similar to transition metal dichalcogenide monolayers, a circularly polarized pulse generates ultrafast valley polarization of such quantum dots. The dependence of the valley polarization on the size of the dot is sensitive to the dot material and, for different materials, show both monotonic increase with the dot radius and nonmonotonic behavior with a local maximum at a finite dot radius.

Observation of Flat band and Van Hove Singularity in Nitrogen Doped Lutetium Hydride. (arXiv:2308.16420v1 [cond-mat.supr-con])
Xin Liang, Zihan Lin, Jun Zhang, Jianfa Zhao, Shiyu Feng, Wenlong Lu, Guodong Wang, Luchuan Shi, Ningning Wang, Pengfei Shan, Muntaser Naamneh, Runzhe Liu, Bastien Michon, Jinguang Cheng, Changqing Jin, Yang Ren, Junzhang Ma

Hydrogen-rich materials offer a compelling avenue towards room temperature superconductivity, albeit under ultra-high pressure. However, the high-pressure environment imposes formidable constraints to investigate the electronic band structure. Even under ambient pressure, the research remains elusive, due to the inherent instability of most of the hydrogen-rich materials upon pressure release. Very recently, high temperature superconductivity has been reported in pressurized lutetium hydrides (~71 K) and nitrogen doped lutetium hydride (~294 K), with the later under debate. Upon decompression, nitrogen doped lutetium hydride manifests a stable metallic phase with dark blue color. This transformation engenders an unprecedented opportunity, allowing for the experimental investigation of the electronic band structure intrinsic to hydrogen-rich material. In this work, using angle resolved photoemission spectroscopy to investigate the nitrogen doped lutetium hydride, we observed significant flat band and a Van Hove singularity marginally below the Fermi level. These salient features, identified as critical elements, proffer potential amplifiers for the realization of heightened superconductivity, potentially extending to room temperature, as evidenced by prior research. Our results not only unveil a confluence of potent strong correlation effects and anisotropy within the Lu-H-N compound, but also provide a prospect for engineering high temperature superconductivity through the strategic manipulation of flat band and the VHS, effectively tailoring their alignment with the Fermi energy.

Localizing Transitions via Interaction-Induced Flat Bands. (arXiv:2308.16440v1 [cond-mat.str-el])
Alireza Parhizkar, Victor Galitski

This paper presents a theory of interaction-induced band-flattening in strongly correlated electron systems. We begin by illustrating an inherent connection between flat bands and index theorems, and presenting a generic prescription for constructing flat bands by periodically repeating local Hamiltonians with topological zero modes. Specifically, we demonstrate that a Dirac particle in an external, spatially periodic magnetic field can be cast in this form. We derive a condition on the field to produce perfectly flat bands and provide an exact analytical solution for the flat band wave functions. Furthermore, we explore an interacting model of Dirac fermions in a spatially inhomogeneous field. We show that certain Hubbard-Stratonovich configurations exist that ``rectify'' the field configuration, inducing band flattening. We present an explicit model where this localization scenario is energetically favorable -- specifically in Dirac systems with nearly flat bands, where the energy cost of rectifying textures is quadratic in the order parameter, whereas the energy gain from flattening is linear. In conclusion, we discuss alternative symmetry-breaking channels, especially superconductivity, and propose that these interaction-induced band-flattening scenarios represent a generic non-perturbative mechanism for spontaneous symmetry breaking, pertinent to many strongly-correlated electron systems.

Topological transition in a parallel electromagnetic field. (arXiv:2308.16448v1 [nucl-th])
Gaoqing Cao

In this work, we attack the problem of "chiral phase instability" ($\chi$PI) in a quantum chromodynamics (QCD) system under a parallel and constant electromagnetic field. The $\chi$PI refers to that: When $I_2\equiv{\bf E\cdot B}$ is larger than the threshold $I_2^c$, no homogeneous solution can be found for $\sigma$ or $\pi^0$ condensate, and the chiral phase (or angle) $\theta$ becomes unstable. Within the two-flavor chiral perturbation theory, we obtain an effective Lagrangian density for $\theta(x)$ where the chiral anomalous Wess-Zumino-Witten term is found to play a role of "source" to the "potential field" $\theta(x)$. The Euler-Lagrangian equation is applied to derive the equation of motion for $\theta(x)$, and physical solutions are worked out for several shapes of system. In the case $I_2>I_2^c$, it is found that the $\chi$PI actually implies an inhomogeneous QCD phase with $\theta(x)$ spatially dependent. By its very nature, the homogeneous-inhomogeneous phase transition is of pure topological and second order at $I_2^c$. Finally, the work is extended to the three-flavor case, where an inhomogeneous $\eta$ condensation is also found to be developed for $I_2>I_2^c$. Correspondingly, there is a second critical point, $I_2^{c'}=24.3I_2^c$, across which the transition is also of topological and second order by its very nature.

Extraordinary Thermoelectric Properties of Topological Surface States in Quantum-Confined Cd3As2 Thin Films. (arXiv:2308.16487v1 [cond-mat.mtrl-sci])
Wenkai Ouyang, Alexander C. Lygo, Yubi Chen, Huiyuan Zheng, Dung Vu, Brandi L. Wooten, Xichen Liang, Wang Yao, Joseph P. Heremans, Susanne Stemmer, Bolin Liao

Topological insulators and semimetals have been shown to possess intriguing thermoelectric properties promising for energy harvesting and cooling applications. However, thermoelectric transport associated with the Fermi arc topological surface states on topological Dirac semimetals remains less explored. In this work, we systematically examine thermoelectric transport in a series of topological Dirac semimetal Cd3As2 thin films grown by molecular beam epitaxy. Surprisingly, we find significantly enhanced Seebeck effect and anomalous Nernst effect at cryogenic temperatures when the Cd3As2 layer is thin. Combining angle-dependent quantum oscillation analysis, magnetothermoelectric measurement, transport modelling and first-principles simulation, we isolate the contributions from bulk and surface conducting channels and attribute the unusual thermoeletric properties to the topological surface states. Our analysis showcases the rich thermoelectric transport physics in quantum-confined topological Dirac semimetal thin films and suggests new routes to achieving high thermoelectric performance at cryogenic temperatures.

Strong electron-phonon coupling and phonon-induced superconductivity in tetragonal C$_3$N$_4$ with hole doping. (arXiv:2308.16507v1 [cond-mat.supr-con])
Alexander N. Rudenko, Danis I. Badrtdinov, Igor A. Abrikosov, Mikhail I. Katsnelson

C$_3$N$_4$ is a recently discovered phase of carbon-nitrides with the tetragonal crystal structure (arXiv:2209.01968) that is stable at ambient conditions. C$_3$N$_4$ is a semiconductor exhibiting flat-band anomalies in the valence band, suggesting the emergence of many-body instabilities upon hole doping. Here, using state-of-the-art first-principles calculations we show that hole-doped C$_3$N$_4$ reveals strong electron-phonon coupling, leading to the formation of a gapped superconducting state. The phase transition temperatures turns out to be strongly dependent on the hole concentration. We propose that holes could be injected into C$_3$N$_4$ via boron doping which induces, according to our results, a rigid shift of the Fermi energy without significant modification of the electronic structure. Based on the electron-phonon coupling and Coulomb pseudopotential calculated from first principles, we conclude that the boron concentration of 6 atoms per nm$^3$ would be required to reach the critical temperature of $\sim$55 K at ambient pressure.

Discovery of interlayer plasmon polaron in graphene/WS$_2$ heterostructures. (arXiv:2308.16509v1 [cond-mat.mes-hall])
Søren Ulstrup, Yann in 't Veld, Jill A. Miwa, Alfred J. H. Jones, Kathleen M. McCreary, Jeremy T. Robinson, Berend T. Jonker, Simranjeet Singh, Roland J. Koch, Eli Rotenberg, Aaron Bostwick, Chris Jozwiak, Malte Rösner, Jyoti Katoch

Harnessing electronic excitations involving coherent coupling to bosonic modes is essential for the design and control of emergent phenomena in quantum materials [1]. In situations where charge carriers induce a lattice distortion due to the electron-phonon interaction, the conducting states get "dressed". This leads to the formation of polaronic quasiparticles that dramatically impact charge transport, surface reactivity, thermoelectric and optical properties, as observed in a variety of crystals and interfaces composed of polar materials [2-6]. Similarly, when oscillations of the charge density couple to conduction electrons the more elusive plasmon polaron emerges [7], which has been detected in electron-doped semiconductors [8-10]. However, the exploration of polaronic effects on low energy excitations is still in its infancy in two-dimensional (2D) materials. Here, we present the discovery of an interlayer plasmon polaron in heterostructures composed of graphene on top of SL WS$_2$. By using micro-focused angle-resolved photoemission spectroscopy (microARPES) during in situ doping of the top graphene layer, we observe a strong quasiparticle peak accompanied by several carrier density-dependent shake-off replicas around the SL WS$_2$ conduction band minimum (CBM). Our results are explained by an effective many-body model in terms of a coupling between SL WS$_2$ conduction electrons and graphene plasmon modes. It is important to take into account the presence of such interlayer collective modes, as they have profound consequences for the electronic and optical properties of heterostructures that are routinely explored in many device architectures involving 2D transition metal dichalcogenides (TMDs) [11-15].

Persistence of structural distortion and bulk band Rashba splitting in SnTe above its ferroelectric critical temperature. (arXiv:2308.16558v1 [cond-mat.mtrl-sci])
Frédéric Chassot (1), Aki Pulkkinen (1,2), Geoffroy Kremer (1,3), Tetiana Zakusylo (4), Gauthier Krizman (4), Mahdi Hajlaoui (4), J. Hugo Dil (5,6), Juraj Krempaský (6), Ján Minár (2), Gunther Springholz (4), Claude Monney (1) ((1) Department of Physics and Fribourg Center for Nanomaterials, Université de Fribourg, Fribourg, Switzerland, (2) New Technologies-Research Center, University of West Bohemia, Plzen, Czech Republic, (3) Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, Campus ARTEM, 2 allée André Guinier, BP 50840, 54011 Nancy, France, (4) Institut für Halbleiter-und Festkörperphysik, Johannes Kepler Universität, Linz, Austria, (5) Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, (6) Photon Science Division, Paul Scherrer Institut, Villigen, Switzerland)

The ferroelectric semiconductor $\alpha$-SnTe has been regarded as a topological crystalline insulator and the dispersion of its surface states has been intensively measured with angle-resolved photoemission spectroscopy (ARPES) over the last decade. However, much less attention has been given to the impact of the ferroelectric transition on its electronic structure, and in particular on its bulk states. Here, we investigate the low-energy electronic structure of $\alpha$-SnTe with ARPES and follow the evolution of the bulk-state Rashba splitting as a function of temperature, across its ferroelectric critical temperature of about $T_c\sim 110$ K. Unexpectedly, we observe a persistent band splitting up to room temperature, which is consistent with an order-disorder contribution to the phase transition that requires the presence of fluctuating local dipoles above $T_c$. We conclude that no topological surface state can occur at the (111) surface of SnTe, at odds with recent literature.

High-T$_C$ superconductivity in $\mathrm{La_3Ni_2O_7}$ based on the bilayer two-orbital t-J model. (arXiv:2308.16564v1 [cond-mat.supr-con])
Zhihui Luo, Biao Lv, Meng Wang, Wéi Wú, Dao-xin Yao

The recently discovered high-T$_C$ superconductor La$_3$Ni$_2$O$_7$ has sparked renewed interest in the unconventional superconductivity. Here we study the unconventional superconductivity in pressurized La$_3$Ni$_2$O$_7$ based on a bilayer two-orbital $t-J$ model, using the renormalized mean-field theory. Our results reveal a robust $s^\pm-$wave pairing driven by the inter-layer $d_{z^2}$ magnetic coupling, which exhibits a transition temperature within the same order of magnitude as the experimentally observed $T_c \sim 80$ K. We obtain a comprehensive superconducting phase diagram in the doping plane. Notably, the La$_3$Ni$_2$O$_7$ under pressure is found situated roughly in the optimal doping regime of the phase diagram. When the $d_{x^2-y^2}$ orbital becomes close to half-filling, $d-$wave and $d+is$ pairing can emerge from the system. We discuss the interplay between the Fermi surface topology and different pairing symmetries. The stability of the $s^\pm-$wave pairing against Hund's coupling and other magnetic exchange couplings is examined.

Interlayer vibrational hybrid normal mode enabling molecular chiral phonons. (arXiv:2308.16779v1 [cond-mat.mtrl-sci])
Hanen Hamdi, Jannis Krumland, Ana M. Valencia, Carlos-Andres Palma, Caterina Cocchi

Organic/inorganic interfaces formed by monolayer substrates and conjugated molecular adsorbates are attractive material platforms leveraging the modularity of organic compounds together with the long-range phenomena typical of condensed matter. New quantum states are known to be generated by electronic interactions in these systems as well as by their coupling with light. However, little is still known about hybrid vibrational modes. In this work, we discover from first principles the existence of an infrared-active chiral phonon mode in a pyrene-decorated MoSe$_{2}$ monolayer given by the combination of a frustrated rotation of the molecule around its central axis and an optical mode in the substrate. Our results suggest the possibility to enable phonon chirality in molecular superlattices.

Tunable magnetic domains in ferrimagnetic MnSb$_2$Te$_4$. (arXiv:2308.16806v1 [cond-mat.str-el])
Tatiana A. Webb, Afrin N. Tamanna, Xiaxin Ding, Jikai Xu, Lia Krusin-Elbaum, Cory R. Dean, Dmitri N. Basov, Abhay N. Pasupathy

Highly tunable properties make Mn(Bi,Sb)$_2$Te$_4$ a rich playground for exploring the interplay between band topology and magnetism: On one end, MnBi$_2$Te$_4$ is an antiferromagnetic topological insulator, while the magnetic structure of MnSb$_2$Te$_4$ (MST) can be tuned between antiferromagnetic and ferrimagnetic. Motivated to control electronic properties through real-space magnetic textures, we use magnetic force microscopy (MFM) to image the domains of ferrimagnetic MST. We find that magnetic field tunes between stripe and bubble domain morphologies, raising the possibility of topological spin textures. Moreover, we combine in situ transport with domain manipulation and imaging to both write MST device properties and directly measure the scaling of the Hall response with domain area. This work demonstrates measurement of the local anomalous Hall response using MFM, and opens the door to reconfigurable domain-based devices in the M(B,S)T family.

Direct measurement of photoinduced transient conducting state in multilayer 2H-MoTe2. (arXiv:2308.16840v1 [cond-mat.mes-hall])
XinYu Zhou, H Wang, Q M Liu, S J Zhang, S X Xu, Q Wu, R S Li, L Yue, T C Hu, J Y Yuan, S S Han, T Dong, D Wu, N L Wang

Ultrafast light-matter interaction has emerged as a powerful tool to control and probe the macroscopic properties of functional materials, especially two-dimensional transition metal dichalcogenides which can form different structural phases with distinct physical properties. However, it is often difficult to accurately determine the transient optical constants. In this work, we developed a near-infrared pump - terahertz to midinfrared (12-22 THz) probe system in transmission geometry to measure the transient optical conductivity in 2H-MoTe2 layered material. By performing separate measurements on bulk and thin-film samples, we are able to overcome issues related to nonuniform substrate thickness and penetration depth mismatch and to extract the transient optical constants reliably. Our results show that photoexcitation at 690 nm induces a transient insulator-metal transition, while photoexcitation at 2 um has a much smaller effect due to the photon energy being smaller than the band gap of the material. Combining this with a single-color pump-probe measurement, we show that the transient response evolves towards 1T' phase at higher flunece. Our work provides a comprehensive understanding of the photoinduced phase transition in the 2H-MoTe2 system.

Yukawa-Lorentz Symmetry in Non-Hermitian Dirac Materials. (arXiv:2308.16907v1 [cond-mat.str-el])
Vladimir Juricic, Bitan Roy

We propose a general construction of symmetry protected Lorentz invariant non-Hermitian (NH) Dirac semimetals (DSMs), realized by invoking masslike anti-Hermitian Dirac operators to its Hermitian counterpart. They feature purely real or imaginary isotropic linear band dispersion, yielding a vanishing density of states. Dynamic mass orderings in NH DSMs thus take place for strong Hubbardlike local interactions through a quantum phase transition where nodal NH Dirac quasiparticles are strongly coupled with bosonic order-parameter fluctuations, hosting a non-Fermi liquid, beyond which the system becomes an insulator. Depending on the internal Clifford algebra between the NH Dirac operator and candidate mass order-parameter, the resulting quantum critical fluid either remains coupled with the environment or recovers full Hermiticity by decoupling from the bath, while always enjoying an emergent Yukawa-Lorentz symmetry in terms of a unique velocity. We showcase the competition between such mass orderings, their hallmarks on quasiparticle spectra in the ordered phases, and the relevance of our findings in correlated designer NH Dirac materials.

Quantized thermal and spin transports of dirty planar topological superconductors. (arXiv:2308.16908v1 [cond-mat.mes-hall])
Sanjib Kumar Das, Bitan Roy

Nontrivial bulk topological invariants of quantum materials can leave their signatures on charge, thermal and spin transports. In two dimensions, their imprints can be experimentally measured from well-developed multi-terminal Hall bar arrangements. Here, we numerically compute the low temperature ($T$) thermal ($\kappa_{xy}$) and zero temperature spin ($\sigma^{sp}_{xy}$) Hall conductivities, and longitudinal thermal conductance ($G^{th}_{xx}$) of various paradigmatic two-dimensional fully gapped topological superconductors, belonging to distinct Altland-Zirnbauer symmetry classes, namely $p+ip$ (class D), $d+id$ (class C) and $p \pm ip$ (class DIII) paired states, in mesoscopic six-terminal Hall bar setups from the scattering matrix formalism using Kwant. In both clean and weak disorder limits, the time-reversal symmetry breaking $p+ip$ and $d+id$ pairings show half-quantized and quantized $\kappa_{xy}$ [in units of $\kappa_0=\pi^2 k^2_B T/(3h)$], respectively, while the latter one in addition accommodates a quantized $\sigma^{sp}_{xy}$ [in units of $\sigma^{sp}_0=\hbar/(8 \pi)$]. By contrast, the time-reversal invariant $p \pm ip$ pairing only displays a quantized $G^{th}_{xx}$ at low $T$ up to a moderate strength of disorder. In the strong disorder regime, all these topological responses ($\kappa_{xy}$, $\sigma^{sp}_{xy}$ and $G^{th}_{xx}$) vanish. Possible material platforms hosting such paired states and manifesting these robust topological thermal and spin responses are highlighted.

Frictional state evolution laws and the non-linear nucleation of dynamic shear rupture. (arXiv:2008.11854v3 [cond-mat.soft] UPDATED)
Robert C. Viesca

We assess if a characteristic length for a non-linear interfacial slip instability follows from theoretical descriptions of sliding friction. We examine friction laws and their coupling with the elasticity of bodies in contact and show that such a length does not always exist. We consider a range of descriptions for frictional strength and show that the area needed to support a slip instability is negligibly small for laws that are more faithful to experimental data. This questions whether a minimum earthquake size exists and shows that the nucleation phase of dynamic rupture contains discriminatory information on the nature of frictional strength evolution.

Variational Monte Carlo Study of Symmetric Mass Generation in a Bilayer Honeycomb Lattice Model. (arXiv:2212.13364v2 [cond-mat.str-el] UPDATED)
Wanda Hou, Yi-Zhuang You

We investigate a bilayer honeycomb lattice model of spin-1/2 fermions at half-filling with local Heisenberg coupling of fermion spins across the two layers. Using variational Monte Carlo (VMC) simulation, we demonstrate that the system undergoes a direct transition from a Dirac semimetal phase to a symmetric gapped phase, known as symmetric mass generation (SMG), as the Heisenberg coupling strength is increased. The transition does not involve spontaneous symmetry breaking or topological order and has been proposed as an example of the fermionic deconfined quantum critical point (fDQCP). Our simulation shows that a fermionic parton bilinear mass opens at the transition point while all symmetries are still preserved thanks to the quantum fluctuations introduced by the correlation factor in the variational wave function. From the simulation data, we extract the critical exponent $\nu=0.96\pm0.03$ and the fermion scaling dimension $\Delta_c=1.31\pm0.04$ at the SMG critical point, which are consistent with the field theoretical prediction of fDQCP in (2+1)D. These findings support the hypothesis that the fermion fractionalizes at the SMG critical point.

Topological Order from Measurements and Feed-Forward on a Trapped Ion Quantum Computer. (arXiv:2302.01917v3 [quant-ph] UPDATED)
Mohsin Iqbal, Nathanan Tantivasadakarn, Thomas M. Gatterman, Justin A. Gerber, Kevin Gilmore, Dan Gresh, Aaron Hankin, Nathan Hewitt, Chandler V. Horst, Mitchell Matheny, Tanner Mengle, Brian Neyenhuis, Ashvin Vishwanath, Michael Foss-Feig, Ruben Verresen, Henrik Dreyer

Quantum systems evolve in time in one of two ways: through the Schr\"odinger equation or wavefunction collapse. So far, deterministic control of quantum many-body systems in the lab has focused on the former, due to the probabilistic nature of measurements. This imposes serious limitations: preparing long-range entangled states, for example, requires extensive circuit depth if restricted to unitary dynamics. In this work, we use mid-circuit measurement and feed-forward to implement deterministic non-unitary dynamics on Quantinuum's H1 programmable ion-trap quantum computer. Enabled by these capabilities, we demonstrate for the first time a constant-depth procedure for creating a toric code ground state in real-time. In addition to reaching high stabilizer fidelities, we create a non-Abelian defect whose presence is confirmed by transmuting anyons via braiding. This work clears the way towards creating complex topological orders in the lab and exploring deterministic non-unitary dynamics via measurement and feed-forward.

Visualizing near-coexistence of massless Dirac electrons and ultra-massive saddle point electrons. (arXiv:2303.02250v2 [cond-mat.mes-hall] UPDATED)
Abhay Kumar Nayak, Jonathan Reiner, Hengxin Tan, Huixia Fu, Henry Ling, Chandra Shekhar, Claudia Felser, Tami Pereg-Barnea, Binghai Yan, Haim Beidenkopf, Nurit Avraham

Strong singularities in the electronic density of states amplify correlation effects and play a key role in determining the ordering instabilities in various materials. Recently high order van Hove singularities (VHSs) with diverging power-law scaling have been classified in single-band electron models. We show that the 110 surface of Bismuth exhibits high order VHS with an usually high density of states divergence $\sim (E)^{-0.7}$. Detailed mapping of the surface band structure using scanning tunneling microscopy and spectroscopy combined with first-principles calculations show that this singularity occurs in close proximity to Dirac bands located at the center of the surface Brillouin zone. The enhanced power-law divergence is shown to originate from the anisotropic flattening of the Dirac band just above the Dirac node. Such near-coexistence of massless Dirac electrons and ultra-massive saddle points enables to study the interplay of high order VHS and Dirac fermions.

Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates. (arXiv:2303.12593v2 [cond-mat.quant-gas] UPDATED)
Tobias Schneider, Wenlong Gao, Thomas Zentgraf, Stefan Schumacher, Xuekai Ma

Topological states have been widely investigated in different types of systems and lattices. In the present work, we report on topological edge states in double-wave (DW) chains, which can be described by a generalized Aubry-Andr\'e-Harper (AAH) model. For the specific system of a driven-dissipative exciton polariton system we show that in such potential chains, different types of edge states can form. For resonant optical excitation, we further find that the optical nonlinearity leads to a multistability of different edge states. This includes topologically protected edge states evolved directly from individual linear eigenstates as well as additional edge states that originate from nonlinearity-induced localization of bulk states. Extending the system into two dimensions (2D) by stacking horizontal DW chains in the vertical direction, we also create 2D multi-wave lattices. In such 2D lattices multiple Su-Schrieffer-Heeger (SSH) chains appear along the vertical direction. The combination of DW chains in the horizontal and SSH chains in the vertical direction then results in the formation of higher-order topological insulator corner states.

Superconductivity in Ternary Scandium Telluride Sc6MTe2 with 3d, 4d, and 5d Transition Metals. (arXiv:2304.01444v2 [cond-mat.supr-con] UPDATED)
Yusaku Shinoda, Yoshihiko Okamoto, Youichi Yamakawa, Haruka Matsumoto, Daigorou Hirai, Koshi Takenaka

We report the discovery of bulk superconductivity in Sc6MTe2 with seven kinds of transition-metal elements M. The critical temperatures for M = 3d elements are higher than those for 4d and 5d elements and increase in the order of M = Ni, Co, and Fe with the highest Tc of 4.7 K in Sc6FeTe2. First principles calculations indicate the presence of significant contribution of Fe 3d orbitals at the Fermi energy, which most likely enhance the Tc of Sc6FeTe2. The upper critical field for M = Os is considerably enhanced by the strong spin-orbit coupling. These results show Sc6MTe2 to constitute a unique family of d-electron superconductors, in which d electrons of 3d and 5d M atoms strongly influence the superconducting properties.

Ground state topology of a four-terminal superconducting double quantum dot. (arXiv:2304.11982v2 [cond-mat.mes-hall] UPDATED)
Lev Teshler, Hannes Weisbrich, Jonathan Sturm, Raffael L. Klees, Gianluca Rastelli, Wolfgang Belzig

In recent years, various classes of systems were proposed to realize topological states of matter. One of them are multiterminal Josephson junctions where topological Andreev bound states are constructed in the synthetic space of superconducting phases. Crucially, the topology in these systems results in a quantized transconductance between two of its terminals comparable to the quantum Hall effect. In this work, we study a double quantum dot with four superconducting terminals and show that it has an experimentally accessible topological regime in which the non-trivial topology can be measured. We also include Coulomb repulsion between electrons which is usually present in experiments and show how the topological region can be maximized in parameter space.

Study of In-plane and Interlayer Interactions During Aluminum Fluoride Intercalation in Graphite: Implications for the Development of Rechargeable Batteries. (arXiv:2306.10385v2 [cond-mat.mtrl-sci] UPDATED)
Sindy J. Rodríguez, Adriana E. Candia, Igor Stancović, Mario C.G. Passeggi (Jr.), Gustavo D. Ruano

The electrolyte intercalation mechanism facilitates the insertion/extraction of charge into the electrode material in rechargeable batteries. Aluminum fluoride (AlF$_{3}$) has been used as an electrolyte in rechargeable aluminum batteries with graphite electrodes, demonstrating improved reversibility of battery charging and discharging processes; however, the intercalation mechanism of this neutral molecule in graphite is so far unknown. In this work, we combine scanning tunneling microscopy (STM) in ultra-high vacuum conditions, calculations based on density functional theory, and large-scale molecular dynamics simulations to reveal the mechanism of AlF$_{3}$ intercalation in highly oriented pyrolytic graphite (HOPG). We report the formation of AlF$_{3}$ molecules clusters between graphite layers, their self-assembly by graphene buckling-mediated interactions, and explain the origin and distribution of superficial {\it blisters} in the material. Our findings have implications for understanding the relationship between the mobility and clustering of molecules and the expansion of the anode material. This, in turn, paves the way for future enhancements in the performance of energy storage systems.

Unveiling Real Triple Degeneracies in Crystals: Exploring Link and Compound Structures. (arXiv:2307.01228v2 [cond-mat.mes-hall] UPDATED)
Wenwen Liu, Hanyu Wang, Biao Yang, Shuang Zhang

With their non-Abelian topological charges, real multi-bandgap systems challenge the conventional topological phase classifications. As the minimal sector of multi-bandgap systems, real triple degeneracies (RTPs), which serve as real 'Weyl points', lay the foundation for the research on real topological phases. However, experimental demonstration of physical systems with global band configurations consisting of multiple RTPs in crystals has not been reported. Here we present experimental evidence of RTPs in photonic meta-crystals, characterizing them using the Euler number, and establishing their connection with both Abelian and non-Abelian charges. By considering RTPs as the basic elements, we further propose the concept of a topological compound, akin to a chemical compound, where we find that certain phases are not topologically allowed. The topological classification of RTPs in crystals demonstrated in our work plays a similar role as the 'no-go' theorem in Weyl systems.

Fermi Surface Spin Texture and Topological Superconductivity in Spin-Orbit Free Non-Collinear Antiferromagnets. (arXiv:2308.09925v2 [cond-mat.supr-con] UPDATED)
Seung Hun Lee, Bohm-Jung Yang

We explore the relationship among the magnetic ordering in real space, the resulting spin texture on the Fermi surface, and the related superconducting gap structure in non-collinear antiferromagnetic metals without spin-orbit coupling. Via a perturbative approach, we show that a non-collinear magnetic ordering in a metal can generate a momentum-dependent spin texture on its Fermi surface, even in the absence of spin-orbit coupling, if the metal has more than three sublattices in its magnetic unit cell. Thus, our theory naturally extends the idea of altermagnetism to non-collinear spin structures. When superconductivity is developed in a magnetic metal, as the gap-opening condition is strongly constrained by the spin texture, the nodal structure of the superconducting state is also enforced by the magnetism-induced spin texture. Taking the non-collinear antiferromagnet on the kagome lattice as a representative example, we demonstrate how the Fermi surface spin texture induced by noncollinear antiferromagnetism naturally leads to odd-parity spin-triplet superconductivity with nontrivial topological properties.

Ab initio Investigations on the Electronic Properties and Stability of Cu-Substituted Lead Apatite (LK-99) family with different doping concentrations (x=0, 1, 2). (arXiv:2308.13938v2 [cond-mat.mtrl-sci] UPDATED)
Songge Yang, Guangchen Liu, Yu Zhong

The pursuit of room-temperature ambient-pressure superconductivity in novel materials has sparked interest, with recent reports suggesting such properties in Cu-substituted lead apatite, known as LK-99. However, these claims lack comprehensive experimental and theoretical support. In this study, we address this gap by conducting ab initio calculations to explore the impact of varying doping concentrations (x = 0, 1, 2) on the stability and electronic properties of five compounds in the LK-99 family. Our investigations confirm the isolated flat bands that intersect the Fermi level in LK-99 (Pb9Cu(PO4)6O:Cu<Pb(1)>). In contrast, the other four parent compounds exhibit insulating behavior with wide band gaps. X-ray diffraction spectra based on the DFT simulations at 0K confirm the presence of Cu substitution on Pb(1) sites in the originally synthesized LK-99 sample, while an extra peak suggests potential alternative like Pb8Cu2(PO4)6 phases due to compositional variations in the original LK-99 samples. Furthermore, the LK-99 structure undergoes substantial lattice constriction, resulting in a significant 5.5% reduction in volume and 6.8% in area of two mutually inverted triangles formed by Pb(2) atoms. Meanwhile, energy calculations reveal a marginal energy preference for substituting Cu on Pb(2) sites over Pb(1) sites, with a difference of approximately 0.010 eV per atom (roughly 0.9645 k/mol). Intriguingly, at pressures exceeding 73 GPa, stability shifts towards LK-99 containing Cu substitutions on Pb(1) sites. Despite exhibiting higher electronic conductivity than parent compounds, Pb9Cu(PO4)6O:Cu<Pb(1)> falls short of the conductivity levels observed in metals or advanced oxide conductors with the simulation based on the Boltzmann transport theory.

ZundEig: The Structure of the Proton in Liquid Water From Unsupervised Learning. (arXiv:2308.15319v2 [cond-mat.mtrl-sci] UPDATED)
Solana Di Pino, Edward Danquah Donkor, Verónica M. Sánchez, Alex Rodriguez, Giuseppe Cassone, Damian Scherlis, Ali Hassanali

The structure of the excess proton in liquid water has been the subject of lively debate from both experimental and theoretical fronts for the last century. Fluctuations of the proton are typically interpreted in terms of limiting states referred to as the Eigen and Zundel species. Here we put these ideas under the microscope taking advantage of recent advances in unsupervised learning that use local atomic descriptors to characterize environments of acidic water combined with advanced clustering techniques. Our agnostic approach leads to the observation of only a single charged cluster and two neutral ones. We demonstrate that the charged cluster involving the excess proton, is best seen as an ionic topological defect in water's hydrogen bond network forming a single local minimum on the global free-energy landscape. This charged defect is a highly fluxional moiety where the idealized Eigen and Zundel species are neither limiting configurations nor distinct thermodynamic states. Instead, the ionic defect enhances the presence of neutral water defects through strong interactions with the network. We dub the combination of the charged and neutral defect clusters as ZundEig demonstrating that the fluctuations between these local environments provide a general framework for rationalizing more descriptive notions of the proton in the existing literature.

Found 6 papers in prb
Date of feed: Fri, 01 Sep 2023 03:17:06 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 polarization reversal in strained thin films of $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$
Anna N. Morozovska, Eugene A. Eliseev, Ayana Ghosh, Mykola E. Yelisieiev, Yulian M. Vysochanskii, and Sergei V. Kalinin
Author(s): Anna N. Morozovska, Eugene A. Eliseev, Ayana Ghosh, Mykola E. Yelisieiev, Yulian M. Vysochanskii, and Sergei V. Kalinin

Strain-induced transitions of polarization reversal in thin films of a ferrielectric $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ (CIPS) with ideally conductive electrodes are explored using the Landau-Ginzburg-Devonshire approach with an eighth-order free energy expansion in polarization powers.…

[Phys. Rev. B 108, 054107] Published Thu Aug 31, 2023

Erratum: Optical control of topological memory based on orbital magnetization [Phys. Rev. B 105, 064423 (2022)]
Sergey S. Pershoguba and Victor M. Yakovenko
Author(s): Sergey S. Pershoguba and Victor M. Yakovenko
[Phys. Rev. B 108, 059904] Published Thu Aug 31, 2023

Atomic coordinates of ${\mathrm{CeNiC}}_{2}$ under pressure: Switching of the Ce-Ce first nearest neighbor direction
Hanming Ma, Dilip Bhoi, Jun Gouchi, Hiroyasu Sato, Toru Shigeoka, J.-G. Cheng, and Yoshiya Uwatoko
Author(s): Hanming Ma, Dilip Bhoi, Jun Gouchi, Hiroyasu Sato, Toru Shigeoka, J.-G. Cheng, and Yoshiya Uwatoko

When pressurized, the heavy fermion compound ${\mathrm{CeNiC}}_{2}$ reveals a rich electronic phase diagram and shows unconventional superconductivity with a transition temperature ${T}_{c}∼3.7$ K, the highest among Ce-based heavy fermion superconductors [Katano et al., Phys. Rev. B 99, 100501(R) (…

[Phys. Rev. B 108, 064435] Published Thu Aug 31, 2023

Real-space and reciprocal-space topology in the ${{\mathrm{Eu}(\mathrm{Ga}}_{1−x}{\mathrm{Al}}_{x})}_{4}$ square net system
Jaime M. Moya, Jianwei Huang, Shiming Lei, Kevin Allen, Yuxiang Gao, Yan Sun, Ming Yi, and E. Morosan
Author(s): Jaime M. Moya, Jianwei Huang, Shiming Lei, Kevin Allen, Yuxiang Gao, Yan Sun, Ming Yi, and E. Morosan

Magnetotransport measurements of the centrosymmetric square net ${{\mathrm{Eu}(\mathrm{Ga}}_{1−x}{\mathrm{Al}}_{x})}_{4}$ compounds reveal evidence of both reciprocal- and real-space topology. For compositions $0.50≤x≤0.90$, several intermediate field phases are found by magnetization measurements w…

[Phys. Rev. B 108, 064436] Published Thu Aug 31, 2023

Magnetoexciton limit of quantum Hall breakdown in graphene
A. Schmitt, M. Rosticher, T. Taniguchi, K. Watanabe, J. M. Berroir, G. Ménard, C. Voisin, G. Fève, M. O. Goerbig, B. Plaçais, and E. Baudin
Author(s): A. Schmitt, M. Rosticher, T. Taniguchi, K. Watanabe, J. M. Berroir, G. Ménard, C. Voisin, G. Fève, M. O. Goerbig, B. Plaçais, and E. Baudin

One of the intrinsic drift velocity limits of the quantum Hall effect is the collective magnetoexciton (ME) instability. It has been demonstrated in bilayer graphene (BLG) using noise measurements [W. Yang et al., Phys. Rev. Lett. 121, 136804 (2018)]. We reproduce this experiment in monolayer graph…

[Phys. Rev. B 108, 085438] Published Thu Aug 31, 2023

First-principles demonstration of Roman-surface topological multiferroicity
Ziwen Wang, Yisheng Chai, and Shuai Dong
Author(s): Ziwen Wang, Yisheng Chai, and Shuai Dong

The concept of topology has been widely applied to condensed matter, going beyond the band crossover in reciprocal spaces. A recent breakthrough suggested unconventional topological physics in a quadruple perovskite ${\mathrm{TbMn}}_{3}{\mathrm{Cr}}_{4}{\mathrm{O}}_{12}$, whose magnetism-induced pol…

[Phys. Rev. B 108, L060407] Published Thu Aug 31, 2023

Found 3 papers in prl
Date of feed: Fri, 01 Sep 2023 03:17:04 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)

Extremal Kerr Black Holes as Amplifiers of New Physics
Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen, and Jorge E. Santos
Author(s): Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen, and Jorge E. Santos

A theoretical analysis suggests that certain rotating black holes might be sensitive probes of quantum gravity.

[Phys. Rev. Lett. 131, 091402] Published Thu Aug 31, 2023

Untwisting Moiré Physics: Almost Ideal Bands and Fractional Chern Insulators in Periodically Strained Monolayer Graphene
Qiang Gao, Junkai Dong, Patrick Ledwith, Daniel Parker, and Eslam Khalaf
Author(s): Qiang Gao, Junkai Dong, Patrick Ledwith, Daniel Parker, and Eslam Khalaf

Moiré systems have emerged in recent years as a rich platform to study strong correlations. Here, we will propose a simple, experimentally feasible setup based on periodically strained graphene that reproduces several key aspects of twisted moiré heterostructures—but without introducing a twist. We …

[Phys. Rev. Lett. 131, 096401] Published Thu Aug 31, 2023

How to Grow a Flat Leaf
Salem al-Mosleh and L. Mahadevan
Author(s): Salem al-Mosleh and L. Mahadevan

Growing a flat lamina such as a leaf is almost impossible without some feedback to stabilize long wavelength modes that are easy to trigger since they are energetically cheap. Here we combine the physics of thin elastic plates with feedback control theory to explore how a leaf can remain flat while …

[Phys. Rev. Lett. 131, 098401] Published Thu Aug 31, 2023

Found 1 papers in pr_res
Date of feed: Fri, 01 Sep 2023 03:17:06 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)

Graph-theoretic characterization of unextendible product bases
Fei Shi, Ge Bai, Xiande Zhang, Qi Zhao, and Giulio Chiribella
Author(s): Fei Shi, Ge Bai, Xiande Zhang, Qi Zhao, and Giulio Chiribella

Unextendible product bases (UPBs) play a key role in the study of quantum entanglement and nonlocality. Here we provide an equivalent characterization of UPBs in graph-theoretic terms. Different from previous graph-theoretic investigations of UPBs, which focused mostly on the orthogonality relations…

[Phys. Rev. Research 5, 033144] Published Thu Aug 31, 2023

Found 1 papers in nano-lett
Date of feed: Thu, 31 Aug 2023 13:10:12 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

[ASAP] One-Step Passivation of Both Sulfur Vacancies and SiO2 Interface Traps of MoS2 Device
Byungwook Ahn, Yoonsok Kim, Meeree Kim, Hyang Mi Yu, Jaehun Ahn, Eunji Sim, Hyunjin Ji, Hamza Zad Gul, Keun Soo Kim, Kyuwook Ihm, Hyoyoung Lee, Eun Kyu Kim, and Seong Chu Lim

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01753

Found 1 papers in sci-rep

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

Author Correction: Congenital toxoplasmosis among hospitalized infants in Poland in the years 2007–2021: study based on the national hospital registry
Aneta Nitsch‑Osuch

Scientific Reports, Published online: 31 August 2023; doi:10.1038/s41598-023-41563-x

Author Correction: Congenital toxoplasmosis among hospitalized infants in Poland in the years 2007–2021: study based on the national hospital registry

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

Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states
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