Found 30 papers in cond-mat
Date of feed: Fri, 23 Jun 2023 00:30:00 GMT

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Thermodynamics of Information. (arXiv:2306.12447v1 [cond-mat.stat-mech])
Juan M. R. Parrondo

As early as 1867, two years after the introduction of the concept of entropy by Clausius, Maxwell showed that the limitations imposed by the second law of thermodynamics depend on the information that one possesses about the state of a physical system. A "very observant and neat-fingered being", later on named Maxwell demon by Kelvin, could arrange the molecules of a gas and induce a temperature or pressure gradient without performing work, in apparent contradiction to the second law. One century later, Landauer claimed that "information is physical", and showed that certain processes involving information, like overwriting a memory, need work to be completed and are unavoidably accompanied by heat dissipation. Thermodynamics of information analyzes this bidirectional influence between thermodynamics and information processing. The seminal ideas that Landauer and Bennett devised in the 1970s have been recently reformulated in a more precise and general way by realizing that informational states are out of equilibrium and applying new tools from non-equilibrium statistical mechanics.

Hunting for Majoranas. (arXiv:2306.12473v1 [cond-mat.supr-con])
Ali Yazdani, Felix von Oppen, Bernhard I. Halperin, Amir Yacoby

Over the last decade, there have been considerable efforts to observe non-abelian quasi-particles in novel quantum materials and devices. These efforts are motivated by the goals of demonstrating quantum statistics of quasi-particles beyond those of fermions and bosons and of establishing the underlying science for the creation of topologically protected quantum bits. In this review, we focus on efforts to create topological superconducting phases hosting Majorana zero modes. We consider the lessons learned from existing experimental efforts, which are motivating both improvemensts to current platforms and exploration of new approaches. Although the experimental detection of non-abelian quasi-particles remains challenging, the knowledge gained thus far and the opportunities ahead offer high potential for discovery and advances in this exciting area of quantum physics.

Topologically Ordered Steady States in Open Quantum Systems. (arXiv:2306.12482v1 [quant-ph])
Zijian Wang, Xu-Dong Dai, He-Ran Wang, Zhong Wang

The interplay between dissipation and correlation can lead to new emergent phenomena. Here we study non-equilibrium phases of matter with robust topological degeneracy of steady states, which is a generalization of the ground-state topological degeneracy of closed systems. Specifically, we construct two representative Lindbladians using engineered dissipation, and exactly solve the steady states with topological degeneracy. We find that while the degeneracy is fragile under noise in two dimensions, it is stable in three dimensions, where a genuine many-body phase with topological degeneracy is realized. We identify universal features of dissipative topological physics such as the deconfined emergent gauge field and slow relaxation dynamics of topological defects. The transition from a topologically ordered phase to a trivial phase is also investigated via numerical simulation. Our work highlights the essential difference between ground-state topological order in closed systems and steady-state topological order in open systems.

SU(4) Symmetry Breaking and Induced Superconductivity in Graphene Quantum Hall Edges. (arXiv:2306.12483v1 [cond-mat.supr-con])
Joseph J. Cuozzo, Enrico Rossi

In graphene, the approximate SU(4) symmetry associated with the spin and valley degrees of freedom in the quantum Hall (QH) regime is reflected in the 4-fold degeneracy of graphene's Landau levels (LL's). Interactions and the Zeeman effect break such approximate symmetry and lift the corresponding degeneracy of the LLs. We study how the breaking of the approximate SU(4) symmetry affects the properties of graphene's QH edge modes located in proximity to a superconductor. We show how the lifting of the 4-fold degeneracy qualitatively modifies the transport properties of the QH-superconductor heterojunction. For the zero LL, by placing the edge modes in proximity to a superconductor, it is in principle possible to realize a 1D topological superconductor supporting Majoranas in the presence of sufficiently strong Zeeman field. We estimate the topological gap of such a topological superconductor and relate it to the properties of the QH-superconductor interface.

Correlated Phases in Spin-Orbit-Coupled Rhombohedral Trilayer Graphene. (arXiv:2306.12486v1 [cond-mat.str-el])
Jin Ming Koh, Jason Alicea, Étienne Lantagne-Hurtubise

Recent experiments indicate that crystalline graphene multilayers exhibit much of the richness of their twisted counterparts, including cascades of symmetry-broken states and unconventional superconductivity. Interfacing Bernal bilayer graphene with a WSe$_2$ monolayer was shown to dramatically enhance superconductivity -- suggesting that proximity-induced spin-orbit coupling plays a key role in promoting Cooper pairing. Motivated by this observation, we study the phase diagram of spin-orbit-coupled rhombohedral trilayer graphene via self-consistent Hartree-Fock simulations, elucidating the interplay between displacement field effects, long-range Coulomb repulsion, short-range (Hund's) interactions, and substrate-induced Ising spin-orbit coupling. In addition to generalized Stoner ferromagnets, we find various flavors of intervalley coherent ground states distinguished by their transformation properties under electronic time reversal, ${\rm C}_3$ rotations, and an effective anti-unitary symmetry. We pay particular attention to broken-symmetry phases that yield Fermi surfaces compatible with zero-momentum Cooper pairing, identifying promising candidate orders that may support spin-orbit-enhanced superconductivity.

Self-doped flat band and spin-triplet superconductivity in monolayer 1T-TaSe$_{2-x}$Te$_{x}$. (arXiv:2306.12493v1 [cond-mat.supr-con])
Jan Phillips, Jose L. Lado, Victor Pardo, Adolfo O. Fumega

Two-dimensional van der Waals materials have become an established platform to engineer flat bands which can lead to strongly-correlated emergent phenomena. In particular, the family of Ta dichalcogenides in the 1\textit{T} phase presents a star-of-David charge density wave that creates a flat band at the Fermi level. For TaS$_2$ and TaSe$_2$ this flat band is at half filling leading to a magnetic insulating phase. In this work, we theoretically demonstrate that ligand substitution in the TaSe$_{2-x}$Te$_x$ system produces a transition from the magnetic insulator to a non-magnetic metal in which the flat band gets doped away from half-filling. For $x\in[{0.846},{1.231}]$ the spin-polarized flat band is self-doped and the system becomes a magnetic metal. In this regime, we show that attractive interactions promote three different spin-triplet superconducting phases as a function of $x$, corresponding to a nodal f-wave and two topologically-different chiral p-wave superconducting phases. Our results establish monolayer TaSe$_{2-x}$Te$_{x}$ as a promising platform for correlated flat band physics leading to unconventional superconducting states.

Spin-orbit torques due to warped topological insulator surface states with an in-plane magnetization. (arXiv:2306.12557v1 [cond-mat.mes-hall])
Mohsen Farokhnezhad, Reza Asgari, Dimitrie Culcer

We investigate the extrinsic spin-orbit torque (SOT) on the surface of topological insulators (TIs), which are characterized by two-dimensional warped Dirac surface states, in the presence of an in-plane magnetization. The interplay between extrinsic spin-orbit scattering and the in-plane magnetization results in a net spin density leading to a SOT. Previous theory suggested that the SOT could only be generated by an out-of-plane magnetic field component, and any in-plane magnetic contribution could be gauged away. However, we demonstrate theoretically that with an in-plane magnetization, the SOT can be finite in TIs due to extrinsic spin-orbit scattering. In the case of a TI model with a linear dispersion relation, the skew scattering term is zero, and the extrinsic spin-orbit scattering influences the side-jump scattering, leading to a finite SOT in TIs. However, when considering the warping term, finite intrinsic and skew scattering terms will arise, in addition to modifications to other scattering terms. We further show that the SOT depends on the azimuthal angles of the magnetization and an external electric field. By adjusting the extrinsic spin-orbit strength, Fermi energy, magnetization strength and warping strength, the resulting SOTs can be maximized. These findings shed light on the interplay between spin-orbit coupling and magnetization in TIs, offering insights into the control and manipulation of spin currents in these systems.

Shear-strain-induced two-dimensional slip avalanches in rhombohedral MoS2. (arXiv:2306.12595v1 [cond-mat.mes-hall])
Jing Liang, Dongyang Yang, Yunhuan Xiao, Sean Chen, Jerry I. Dadap, Joerg Rottler, Ziliang Ye

Slip avalanches are ubiquitous phenomena occurring in 3D materials under shear strain and their study contributes immensely to our understanding of plastic deformation, fragmentation, and earthquakes. So far, little is known about the role of shear strain in 2D materials. Here we show some evidence of two-dimensional slip avalanches in exfoliated rhombohedral MoS2, triggered by shear strain near the threshold level. Utilizing interfacial polarization in 3R-MoS2, we directly probe the stacking order in multilayer flakes and discover a wide variety of polarization domains with sizes following a power-law distribution. These findings suggest slip avalanches can occur during the exfoliation of 2D materials, and the stacking orders can be changed via shear strain. Our observation has far-reaching implications for developing new materials and technologies, where precise control over the atomic structure of these materials is essential for optimizing their properties as well as for our understanding of fundamental physical phenomena.

Deconfined quantum critical points: a review. (arXiv:2306.12638v1 [cond-mat.str-el])
T. Senthil

Continuous phase transitions in equilibrium statistical mechanics were successfully described 50 years ago with the development of the renormalization group framework. This framework was initially developed in the context of phase transitions whose universal properties are captured by the long wavelength (and long time) fluctuations of a Landau order parameter field. Subsequent developments include a straightforward generalization to a class of $T = 0$ phase transitions driven by quantum fluctuations. In the last 2 decades it has become clear that there is a vast landscape of quantum phase transitions where the physics is not always usefully (or sometimes cannot be) formulated in terms of fluctuations of a Landau order parameter field. A wide class of such phase transitions - dubbed deconfined quantum critical points - involve the emergence of fractionalized degrees of freedom coupled to emergent gauge fields. Here I review some salient aspects of these deconfined critical points.

Fermi surface reconstruction due to the orthorhombic distortion in Dirac semimetal YbMnSb$_2$. (arXiv:2306.12732v1 [cond-mat.mtrl-sci])
Dilip Bhoi, Feng Ye, Hanming Ma, Xiaoling Shen, Arvind Maurya, Shusuke Kasamatsu, Takahiro Misawa, Kazuyoshi Yoshimi, Taro Nakajima, Masaaki Matsuda, Yoshiya Uwatoko

Dirac semi-metal with magnetic atoms as constituents delivers an interesting platform to investigate the interplay of Fermi surface (FS) topology, electron correlation, and magnetism. One such family of semi-metal is YbMn$Pn_2$ ($Pn$ = Sb, Bi), which is being actively studied due to the intertwined spin and charge degrees of freedom. In this Letter, we investigate the relationship between the magnetic/crystal structures and FS topology of YbMnSb$_2$ using single crystal x-ray diffraction, neutron scattering, magnetic susceptibility, magnetotransport measurement and complimentary DFT calculation. Contrary to previous reports, the x-ray and neutron diffraction reveal that YbMnSb$_2$ crystallizes in an orthorhombic $Pnma$ structure with notable anti-phase displacement of the magnetic Mn ions that increases in magnitude upon cooling. First principles DFT calculation reveals a reduced Brillouin zone and more anisotropic FS of YbMnSb$_2$ compared to YbMnBi$_2$ as a result of the orthorhombicity. Moreover, the hole type carrier density drops by two orders of magnitude as YbMnSb$_2$ orders antiferromagnetically indicating band folding in magnetic ordered state. In addition, the Landau level fan diagram yields a non-trivial nature of the SdH quantum oscillation frequency arising from the Dirac-like Fermi pocket. These results imply that YbMnSb$_2$ is an ideal platform to explore the interplay of subtle lattice distortion, magnetic order, and topological transport arising from relativistic quasiparticles.

Polarization-tuneable excitonic spectral features in the optoelectronic response of atomically thin ReS2. (arXiv:2306.12798v1 [cond-mat.mtrl-sci])
Daniel Vaquero-Monte, Olga Arroyo-Gascón, Juan Salvador-Sánchez, Pedro L. Alcázar-Ruano, Enrique Diez, Ana Perez-Rodríguez, Julián D. Correa, Francisco Dominguez-Adame, Leonor Chico, Jorge Quereda

The low crystal symmetry of rhenium disulphide (ReS2) leads to the emergence of dichroic optical and optoelectronic response, absent in other layered transition metal dichalcogenides, which could be exploited for device applications requiring polarization resolution. To date, spectroscopy studies on the optical response of ReS2 have relied almost exclusively in characterization techniques involving optical detection, such as photoluminescence, absorbance, or reflectance spectroscopy. However, to realize the full potential of this material, it is necessary to develop knowledge on its optoelectronic response with spectral resolution. In this work, we study the polarization-dependent photocurrent spectra of few-layer ReS2 photodetectors, both in room conditions and at cryogenic temperature. Our spectral measurements reveal two main exciton lines at energies matching those reported for optical spectroscopy measurements, as well as their excited states. Moreover, we also observe an additional exciton-like spectral feature with a photoresponse intensity comparable to the two main exciton lines. We attribute this feature, not observed in earlier photoluminescence measurements, to a non-radiative exciton transition. The intensities of the three main exciton features, as well as their excited states, modulate with linear polarization of light, each one acquiring maximal strength at a different polarization angle. We have performed first-principles exciton calculations employing the Bethe-Salpeter formalism, which corroborate our experimental findings. Our results bring new perspectives for the development of ReS2-based nanodevices.

Momentum matching and band-alignment type in van der Waals heterostructures: Interfacial effects and materials screening. (arXiv:2306.12821v1 [cond-mat.mtrl-sci])
Yue-Jiao Zhang, Yin-Ti Ren, Xiao-Huan Lv, Xiao-Lin Zhao, Rui Yang, Nie-Wei Wang, Chen-Dong Jin, Hu Zhang, Ru-Qian Lian, Peng-Lai Gong, Rui-Ning Wang, Jiang-Long Wang, Xing-Qiang Shi

Momentum-matched type II van der Waals heterostructures (vdWHs) have been designed by assembling layered two-dimensional semiconductors (2DSs) with special band-structure combinations - that is, the valence band edge at the Gamma point (the Brillouin-zone center) for one 2DS and the conduction band edge at the Gamma point for the other [Ubrig et al., Nat. Mater. 19, 299 (2020)]. However, the band offset sizes, band-alignment types, and whether momentum matched or not, all are affected by the interfacial effects between the component 2DSs, such as the quasichemical-bonding (QB) interaction between layers and the electrical dipole moment formed around the vdW interface. Here, based on density-functional theory calculations, first we probe the interfacial effects (including different QBs for valence and conduction bands, interface dipole, and, the synergistic effects of these two aspects) on band-edge evolution in energy and valley (location in the Brillouin zone) and the resulting changes in band alignment and momentum matching for a typical vdWH of monolayer InSe and bilayer WS2, in which the band edges of subsystems satisfy the special band-structure combination for a momentum-matched type II vdWH. Then, based on the conclusions of the studied interfacial effects, we propose a practical screening method for robust momentum-matched type II vdWHs. This practical screening method can also be applied to other band alignment types. Our current study opens a way for practical screening and designing of vdWHs with robust momentum-matching and band alignment type.

Out-of-equilibrium charge redistribution in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy. (arXiv:2306.12905v1 [cond-mat.str-el])
Denny Puntel, Dmytro Kutnyakhov, Lukas Wenthaus, Markus Scholz, Nils O. Wind, Michael Heber, Günter Brenner, Genda Gu, Robert J. Cava, Wibke Bronsch, Federico Cilento, Fulvio Parmigiani, Federico Pressacco

Charge-transfer excitations are of paramount importance for understanding the electronic structure of copper-oxide based high-temperature superconductors. In this study, we investigate the response of a Bi$_2$Sr$_2$CaCu$_2$O$_{\mathrm{8}+ \delta}$ crystal to the charge redistribution induced by an infrared ultrashort pulse. Element-selective time-resolved core-level photoelectron spectroscopy with a high energy resolution allows disentangling the dynamics of oxygen ions with different coordination and bonds thanks to their different chemical shifts. Our experiment shows that the O\,$1s$ component arising from the Cu-O planes is significantly perturbed by the infrared light pulse. Conversely, the apical oxygen, also coordinated with Sr ions in the Sr-O planes, remains unaffected. This result highlights the peculiar behavior of the electronic structure of the Cu-O planes. It also unlocks the way to study the out-of-equilibrium electronic structure of copper-oxide-based high-temperature superconductors by identifying the O\,$1s$ core-level emission originating from the oxygen ions in the Cu-O planes. This ability could be critical to gain information about the strongly-correlated electron ultrafast dynamical mechanisms in the Cu-O plane in the normal and superconducting phases.

Topological defects at smectic interfaces as a potential tool for the biosensing of living microorganisms. (arXiv:2306.12989v1 [cond-mat.soft])
Vajra S. Badha, Tagbo H.R. Niepa, Mohamed Amine Gharbi

Characterizing the anchoring properties of smectic liquid crystals (LCs) in contact with bacterial solutions is crucial for developing biosensing platforms. In this study, we investigate the anchoring properties of a smectic LC when exposed to Bacillus Subtilis and Escherichia coli bacterial solutions using interfaces with known anchoring properties. By monitoring the optical response of the smectic film, we successfully distinguish different types of bacteria, leveraging the distinct changes in the LC's response. Through a comprehensive analysis of the interactions between bacterial proteins and the smectic interface, we elucidate the potential underlying mechanisms responsible for these optical changes. Additionally, we introduce the utilization of topological defects; the focal conic domains (FCDs), at the smectic interface as an indicative measure of the bacterial concentration. Our findings demonstrate the significant potential of smectic LCs and their defects for biosensing applications and contribute to our understanding of bacteria- LC interactions, paving the way for advancements in pathogen detection and protein-based sensing.

Gilbert damping in metallic ferromagnets from Schwinger-Keldysh field theory: Nonlocality, nonuniformity, and anisotropy in the presence of spin-orbit coupling. (arXiv:2306.13013v1 [cond-mat.mes-hall])
Felipe Reyes-Osorio, Branislav K. Nikolic

Understanding the origin of damping mechanisms in magnetization dynamics of metallic ferromagnets is a fundamental problem for nonequilibrium many-body physics of systems where quantum conduction electrons interact with localized spins assumed to be governed by the classical Landau-Lifshitz-Gilbert (LLG) equation. It is also of critical importance for applications as damping affects energy consumption and speed of spintronic and magnonic devices. Since the 1970s, a variety of linear-response and scattering theory approaches have been developed to produce widely used formulas for computation of spatially-independent Gilbert scalar parameter as the magnitude of the Gilbert damping term in the LLG equation. The largely-unexploited-for-this-purpose Schwinger-Keldysh field theory (SKFT) offers additional possibilities, such as rigorously deriving an extended LLG equation by integrating quantum electrons out. Here we derive such equation whose Gilbert damping for metallic ferromagnets in $d=1$-$3$ dimensions is nonlocal-i.e., dependent on position of all localized spins at a given time-and nonuniform, even if all localized spins are collinear and spin-orbit coupling (SOC) is absent. This is in sharp contrast to standard lore, where nonlocal damping is possible only if localized spins are noncollinear, while SOC is required to obtain a standard Gilbert damping scalar parameter for collinear localized spins. The same mechanism, which is physically due to retarded response of conduction electronic spins to the motion of localized spins, generates wavevector-dependent damping on spin waves, whereas nonzero SOC makes nonlocal damping anisotropic. Our analytical formulas, with their nonlocality being more prominent in low spatial dimensions $d \le 2$, are fully corroborated by numerically exact $d=1$ quantum-classical simulations.

Axion Insulator State in Hundred-Nanometer-Thick Magnetic Topological Insulator Sandwich Heterostructures. (arXiv:2306.13016v1 [cond-mat.mes-hall])
Deyi Zhuo, Zi-Jie Yan, Zi-Ting Sun, Ling-Jie Zhou, Yi-Fan Zhao, Ruoxi Zhang, Ruobing Mei, Hemian Yi, Ke Wang, Moses H. W. Chan, Chao-Xing Liu, K. T. Law, Cui-Zu Chang

An axion insulator is a three-dimensional (3D) topological insulator (TI), in which the bulk maintains the time-reversal symmetry or inversion symmetry but the surface states are gapped by surface magnetization. The axion insulator state has been observed in molecular beam epitaxy (MBE)-grown magnetically doped TI sandwiches and exfoliated intrinsic magnetic TI MnBi2Te4 flakes with an even number layer. All these samples have a thickness of ~10 nm, near the 2D-to-3D boundary. The coupling between the top and bottom surface states in thin samples may hinder the observation of quantized topological magnetoelectric response. Here, we employ MBE to synthesize magnetic TI sandwich heterostructures and find that the axion insulator state persists in a 3D sample with a thickness of ~106 nm. Our transport results show that the axion insulator state starts to emerge when the thickness of the middle undoped TI layer is greater than ~3 nm. The 3D hundred-nanometer-thick axion insulator provides a promising platform for the exploration of the topological magnetoelectric effect and other emergent magnetic topological states, such as the high-order TI phase.

Magnetic Dirac semimetal state of (Mn,Ge)Bi$_2$Te$_4$. (arXiv:2306.13024v1 [cond-mat.mtrl-sci])
Alexander S. Frolov, Dmitry Yu. Usachov, Artem V. Tarasov, Alexander V. Fedorov, Kirill A. Bokai, Ilya Klimovskikh, Vasily S. Stolyarov, Anton I. Sergeev, Alexander N. Lavrov, Vladimir A. Golyashov, Oleg E. Tereshchenko, Giovanni Di Santo, Luca Petaccia, Oliver J. Clark, Jaime Sanchez-Barriga, Lada V. Yashina

For quantum electronics, the possibility to finely tune the properties of magnetic topological insulators (TIs) is a key issue. We studied solid solutions between two isostructural Z$_2$ TIs, magnetic MnBi$_2$Te$_4$ and nonmagnetic GeBi$_2$Te$_4$, with Z$_2$ invariants of 1;000 and 1;001, respectively. For high-quality, large mixed crystals of Ge$_x$Mn$_{1-x}$Bi$_2$Te$_4$, we observed linear x-dependent magnetic properties, composition-independent pairwise exchange interactions along with an easy magnetization axis. The bulk band gap gradually decreases to zero for $x$ from 0 to 0.4, before reopening for $x>0.6$, evidencing topological phase transitions (TPTs) between topologically nontrivial phases and the semimetal state. The TPTs are driven purely by the variation of orbital contributions. By tracing the x-dependent $6p$ contribution to the states near the fundamental gap, the effective spin-orbit coupling variation is extracted. As $x$ varies, the maximum of this contribution switches from the valence to the conduction band, thereby driving two TPTs. The gapless state observed at $x=0.42$ closely resembles a Dirac semimetal above the Neel temperature and shows a magnetic gap below, which is clearly visible in raw photoemission data. The observed behavior of the Ge$_x$Mn$_{1-x}$Bi$_2$Te$_4$ system thereby demonstrates an ability to precisely control topological and magnetic properties of TIs.

Strain-induced frustrated helimagnetism and topological spin textures in LiCrTe$_{2}$. (arXiv:2306.13035v1 [cond-mat.mtrl-sci])
Weiyi Pan, Junsheng Feng

By performing first-principles calculations in conjunction with Monte Carlo simulations, we systematically investigated the frustrated magnetic states induced by in-plane compressive strain in LiCrTe$_{2}$. Our calculations support that the magnetic ground state of LiCrTe$_{2}$ crystal is A-type antiferromagnetic (AFM), with an in-plane ferromagnetic (FM) state and interlayer AFM coupling. Furthermore, it is found that compressive strain can significantly alter the magnetic interactions, giving rise to a transition from an in-plane FM to an AFM state, undergoing a helimagnetic phase. Remarkably, a highly frustrated helimagnetic state with disordered spin spirals under moderate strain arises from the competition between spiral propagation modes along distinct directions. In addition, various topological spin defects emerge in this frustrated helimagnetic phase, which are assembled from various domain wall units. These topological defects can be further tuned with external magnetic fields. Our calculations not only uncover the origin of exotic frustrated magnetism in triangular lattice magnetic systems, but also offer a promising route to engineer the frustrated and topological magnetic state, which is of significance in both fundamental research and technological applications.

Gain-loss induced non-Abelian Bloch braids. (arXiv:2306.13056v1 [quant-ph])
B. Midya

Onsite gain-loss induced topological braiding principles of non-Hermitian energy bands is theoretically formulated in multiband lattice models with Hermitian hopping amplitudes. Braid phase transition occurs when the gain-loss parameter is tuned across exceptional point degeneracies. Laboratory realizable effective-Hamiltonians are proposed to realize braid groups $\mathbb{B}_2$ and $\mathbb{B}_3$ of two and three bands respectively. While $\mathbb{B}_2$ is trivially Abelian, the group $\mathbb{B}_3$ features non-Abelian braiding and energy permutation. Phase diagrams with respect to lattice parameters to realize braid group generators and their non-commutativity are shown. The proposed theory is conducive to synthesize exceptional materials for applications in topological quantum photonic computation and information processing.

Disorder-induced topological quantum phase transitions in Euler semimetals. (arXiv:2306.13084v1 [cond-mat.mes-hall])
Wojciech J. Jankowski, Mohammedreza Noormandipour, Adrien Bouhon, Robert-Jan Slager

We study the effect of disorder in systems having a non-trivial Euler class. As these recently proposed multi-gap topological phases come about by braiding non-Abelian charged band nodes residing between different bands to induce stable pairs within isolated band subspaces, novel properties that include a finite critical phase under the debraiding to a metal rather than a transition point and a modified stability may be expected when the disorder preserves the underlying $C_2\cal{T}$ or $\cal{P}\cal{T}$ symmetry on average. Employing elaborate numerical computations, we verify the robustness of associated topology by evaluating the changes in the average densities of states and conductivities for different types of disorders. Upon performing a scaling analysis around the corresponding quantum critical points we retrieve a universality for the localization length exponent of $\nu = 1.4 \pm 0.1$ for Euler-protected phases, relating to 2D percolation models. We generically find that quenched disorder drives Euler semimetals into critical metallic phases. Finally, we show that magnetic disorder can also induce topological transitions to quantum anomalous Hall plaquettes with local Chern numbers determined by the initial value of the Euler invariant.

Atiyah-Hirzebruch Spectral Sequence in Band Topology: General Formalism and Topological Invariants for 230 Space Groups. (arXiv:1802.06694v2 [cond-mat.str-el] UPDATED)
Ken Shiozaki, Masatoshi Sato, Kiyonori Gomi

We study the Atiyah-Hirzebruch spectral sequence (AHSS) for equivariant K-theory in the context of band theory. Various notions in the band theory such as irreducible representations at high-symmetric points, the compatibility relation, topological gapless and singular points naturally fits into the AHSS. As an application of the AHSS, we get the complete list of topological invariants for 230 space groups without time-reversal or particle-hole invariance. We find that a lot of torsion topological invariants appear even for symmorphic space groups.

Generalized homology and Atiyah-Hirzebruch spectral sequence in crystalline symmetry protected topological phenomena. (arXiv:1810.00801v2 [cond-mat.str-el] UPDATED)
Ken Shiozaki, Charles Zhaoxi Xiong, Kiyonori Gomi

We propose that symmetry protected topological (SPT) phases with crystalline symmetry are formulated by equivariant generalized homologies $h^G_n(X)$ over a real space manifold $X$ with $G$ a crystalline symmetry group. The Atiyah-Hirzebruch spectral sequence unifies various notions in crystalline SPT phases such as the layer construction, higher-order SPT phases and Lieb-Schultz-Mattis type theorems. Our formulation is applicable to interacting systems with onsite and crystalline symmetries as well as free fermions.

Discrete global symmetries and dynamics of emergent fermions. (arXiv:2209.00410v2 [cond-mat.str-el] UPDATED)
Fan Yang, Fei Zhou

Global symmetries that define the number of low energy degrees of freedom have profound consequences on universal properties near topological quantum critical points and in other gapless or nearly gapless states of emergent fermions. We take a $Z_2$ global symmetry (such as time-reversal) as an example to study its effect on thermodynamic and transport properties. Although the thermal entropy density of $Z_2$ symmetric systems is simply twice of their counterparts without any global symmetries or the $Z_1$ class, the temperature dependence of thermal conductivity $\kappa$ is distinctly and drastically different for different symmetries. For systems with dynamic exponent $z=1$, in the $Z_2$ symmetric class, we have $\kappa\propto T^{-(d-1)}$ in the quantum critical regime near weakly interacting fixed points, while for systems with no global symmetries (i.e., the $Z_1$ class), we have $\kappa\propto T^{-(d+3)}$, with $d$ being the spatial dimension. Only near strong coupling fixed points, both cases with or without $Z_2$ global symmetries follow the same scaling function, $\kappa \propto T^{d-1}$. These distinct scalings of thermal conductivity can also appear in gapless surface Majorana states.

Electronic band structure changes across the antiferromagnetic phase transition of exfoliated MnPS$_3$ probed by $\mu$-ARPES. (arXiv:2211.05501v2 [cond-mat.mtrl-sci] UPDATED)
Jeff Strasdas, Benjamin Pestka, Milosz Rybak, Adam K. Budniak, Niklas Leuth, Honey Boban, Vitaliy Feyer, Iulia Cojocariu, Daniel Baranowski, José Avila, Pavel Dudin, Aaron Bostwick, Chris Jozwiak, Eli Rotenberg, Carmine Autieri, Yaron Amouyal, Lukasz Plucinski, Efrat Lifshitz, Magdalena Birowska, Markus Morgenstern

Exfoliated magnetic 2D materials enable versatile tuning of magnetization, e.g., by gating or providing proximity-induced exchange interaction. However, their electronic band structure after exfoliation has not been probed, most likely due to their photochemical sensitivity. Here, we provide micron-scale angle-resolved photoelectron spectroscopy of the exfoliated intralayer antiferromagnet MnPS$_3$ above and below the N\'{e}el temperature down to one monolayer. The favorable comparison with density functional theory calculations enables to identify the orbital character of the observed bands. Consistently, we find pronounced changes across the N\'{e}el temperature for bands that consist of Mn 3d and 3p levels of adjacent S atoms. The deduced orbital mixture indicates that the superexchange is relevant for the magnetic interaction. There are only minor changes between monolayer and thicker films demonstrating the predominant 2D character of MnPS$_3$. The novel access is transferable to other MPX$_3$ materials (M: transition metal, P: phosphorus, X: chalcogenide) providing a multitude of antiferromagnetic arrangements.

Thermodynamics and its Prediction and CALPHAD Modeling: Review, State of the Art, and Perspectives. (arXiv:2301.02132v5 [cond-mat.stat-mech] UPDATED)
Zi-Kui Liu

Thermodynamics is a science concerning the state of a system, whether it is stable, metastable, or unstable. The combined law of thermodynamics derived by Gibbs about 150 years ago laid the foundation of thermodynamics. In Gibbs combined law, the entropy production due to internal processes was not included, and the 2nd law was thus practically removed from the Gibbs combined law, so it is only applicable to systems under equilibrium. Gibbs further derived the classical statistical thermodynamics in terms of the probability of configurations in a system. With the quantum mechanics (QM) developed, the QM-based statistical thermodynamics was established and connected to classical statistical thermodynamics at the classical limit as shown by Landau. The development of density function theory (DFT) by Kohn and co-workers enabled the QM prediction of properties of the ground state of a system. On the other hand, the entropy production due to internal processes in non-equilibrium systems was studied separately by Onsager and Prigogine and co-workers. The digitization of thermodynamics was developed by Kaufman in the framework of the CALPHAD modeling of individual phases. Our recently termed zentropy theory integrates DFT and statistical mechanics through the replacement of the internal energy of each individual configuration by its DFT-predicted free energy. Furthermore, through the combined law of thermodynamics with the entropy production as a function of internal degrees of freedom, it is shown that the kinetic coefficient matrix of independent internal processes is diagonal with respect to the conjugate potentials in the combined law, and the cross phenomena represented by the phenomenological Onsager reciprocal relationships are due to the dependence of the conjugate potential of the molar quantity in a flux on nonconjugate potentials.

Flavor symmetry breaking in spin-orbit coupled bilayer graphene. (arXiv:2302.12284v3 [cond-mat.str-el] UPDATED)
Ming Xie, Sankar Das Sarma

Recent experimental discovery of flavor symmetry breaking metallic phases in Bernal-stacked bilayer graphene points to the strongly interacting nature of electrons near the top (bottom) of its valence (conduction) band. Superconductivity was also observed in between these symmetry breaking phases when the graphene bilayer is placed under a small in-plane magnetic field or in close proximity to a monolayer WSe$_2$ substrate. Here we address the correlated nature of the band edge electrons and obtain the quantum phase diagram of their many-body ground states incorporating the effect of proximity induced spin-orbit coupling. We find that in addition to the spin/valley flavor polarized half and quarter metallic states, two types of intervalley coherent phases emerge near the phase boundaries between the flavor polarized metals. Both spin-orbit coupling and in-plane magnetic field disfavor the spin-unpolarized valley coherent phase. Our findings suggest possible competition between intervalley coherence and superconducting orders, arising from the intriguing correlation effects in bilayer graphene in the presence of spin-orbit coupling.

Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array. (arXiv:2303.12111v2 [quant-ph] UPDATED)
Yunzhao Wang, Kyrylo Snizhko, Alessandro Romito, Yuval Gefen, Kater Murch

We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states with symmetry-protected topological order.

Specifically, we consider the experimental platform consisting of superconducting transmon circuits and linear microwave resonators. We perform theoretical modeling of this platform via pulse-level simulations based on physical features of real devices. In our protocol, transmon qutrits are mapped onto spin-1 systems. The qutrits' sharing of nearest-neighbor dispersive coupling to a dissipative microwave resonator enables elimination of state population in the $S^\mathrm{total}=2$ subspace for each adjacent pair, and thus, the stabilization of the manybody system into the Affleck, Kennedy, Lieb, and Tasaki (AKLT) state up to the edge mode configuration. We also analyze the performance of our protocol as the system size scales up to four qutrits, in terms of its fidelity as well as the stabilization time. Our work shows the capacity of driven-dissipative superconducting cQED systems to host robust and self-corrected quantum manybody states that are topologically non-trivial.

Geometric aspects of nonlinear and nonequilibrium phenomena. (arXiv:2303.12252v2 [cond-mat.mes-hall] UPDATED)
Takahiro Morimoto, Sota Kitamura, Naoto Nagaosa

We review recent developments in the research of nonlinear and nonequilibrium phenomena in solids focusing on their geometrical aspects. We start with introducing the basic concepts of geometrical phases of Bloch electrons and Floquet theory for periodically driven systems. Then we review recent attempts to engineer topological phases in nonequilibrium matters such as graphene, magnets, and superconductors irradiated with circularly polarized light. We next review a bulk photovoltaic effect of inversion broken materials focusing on the shift current response. The shift current is described with Berry connections and has a close relationship to the modern theory of polarization. We further review recent extensions of the shift current to correlated electron systems. Finally, we explain the geometric diabatic time evolution in the Zener tunneling process and its consequences on nonreciprocal transport.

Weak Localization and Antilocalization in Twisted Bilayer Graphene. (arXiv:2303.16436v2 [cond-mat.mes-hall] UPDATED)
Hongyi Yan, Haiwen Liu

In this study, we investigate the weak localization (WL) and weak antilocalization (WAL) effects in twisted bilayer graphene positioned on a hexagonal boron nitride substrate. The bottom graphene layer aligns with the hexagonal boron nitride. The top layer of the system features a Dirac cone with a negligible gap, while the bottom layer possesses a relatively large band gap. With a low concentration of impurities, the quantum correction to conductivity stems from the quantum interference between two time-reversed impurity scattering trajectories. We discover that inter-layer scattering significantly contributes to the conductivity correction when the Fermi surface areas of the two valleys at low energy are comparable. A double crossover from WL to WAL andback to WL occurs at a specific range of Fermi energy, which is particularly intriguing.

Quantum Geometry of Non-Hermitian Topological Systems. (arXiv:2305.17675v3 [cond-mat.stat-mech] UPDATED)
Chao Chen Ye, W. L. Vleeshouwers, S. Heatley, V. Gritsev, C. Morais Smith

Topological insulators have been studied intensively over the last decades. Earlier research focused on Hermitian Hamiltonians, but recently, peculiar and interesting properties were found by introducing non-Hermiticity. In this work, we apply a quantum geometric approach to various Hermitian and non-Hermitian versions of the Su-Schrieffer-Heeger (SSH) model. We find that this method allows one to correctly identify different topological phases and topological phase transitions for all SSH models, but only when using the metric tensor containing both left and right eigenvectors. Whereas the quantum geometry of Hermitian systems is Riemannian, introducing non-Hermiticity leads to pseudo-Riemannian and complex geometries, thus significantly generalizing from the quantum geometries studied thus far. One remarkable example of this is the mathematical agreement between topological phase transition curves and lightlike paths in general relativity, suggesting a possibility of simulating space-times in non-Hermitian systems. We find that the metric in non-Hermitian phases degenerates in such a way that it effectively reduces the dimensionality of the quantum geometry by one. This implies that within linear response theory, one can perturb the system by a particular change of parameters while maintaining a zero excitation rate.

Found 5 papers in prb
Date of feed: Fri, 23 Jun 2023 03:16:57 GMT

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

Anomalous Hall effect in type-I Weyl metals beyond the noncrossing approximation
Jia-Xing Zhang and Wei Chen (陈薇)
Author(s): Jia-Xing Zhang and Wei Chen (陈薇)

We study the anomalous Hall effect (AHE) in tilted Weyl metals with Gaussian disorder due to the crossed $X$ and $\mathrm{Ψ}$ diagrams in this work. The importance of such diagrams to the AHE has been demonstrated recently in two-dimensional (2D) massive Dirac model and Rashba ferromagnets. It has b…

[Phys. Rev. B 107, 214204] Published Thu Jun 22, 2023

Possible evidence of Weyl fermion enhanced thermal conductivity under magnetic fields in the antiferromagnetic topological insulator $\mathrm{Mn}{({\mathrm{Bi}}_{1−x}{\mathrm{Sb}}_{x})}_{2}{\mathrm{Te}}_{4}$
Robert A. Robinson, Seng Huat Lee, Lujin Min, Jinliang Ning, Jianwei Sun, and Zhiqiang Mao
Author(s): Robert A. Robinson, Seng Huat Lee, Lujin Min, Jinliang Ning, Jianwei Sun, and Zhiqiang Mao

We report thermal conductivity and Seebeck effect measurements on $\text{Mn}{({\text{Bi}}_{1−x}{\text{Sb}}_{x})}_{2}{\text{Te}}_{4}$ (MBST) with $x=0.26$ under applied magnetic fields below $50\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Our data shows clear indications of the electronic structure trans…

[Phys. Rev. B 107, 235140] Published Thu Jun 22, 2023

Signatures of a topological phase transition in a planar Josephson junction
A. Banerjee, O. Lesser, M. A. Rahman, H.-R. Wang, M.-R. Li, A. Kringhøj, A. M. Whiticar, A. C. C. Drachmann, C. Thomas, T. Wang, M. J. Manfra, E. Berg, Y. Oreg, Ady Stern, and C. M. Marcus
Author(s): A. Banerjee, O. Lesser, M. A. Rahman, H.-R. Wang, M.-R. Li, A. Kringhøj, A. M. Whiticar, A. C. C. Drachmann, C. Thomas, T. Wang, M. J. Manfra, E. Berg, Y. Oreg, Ady Stern, and C. M. Marcus

Intense scrutiny over the last decade of experiments on a variety of platforms aiming to identify topological superconductivity has raised the stakes in this search. Because nontopological Andreev bound states at or near zero energy can resemble topological states, signatures beyond spectroscopy of zero-energy modes are called for. A key signature of a topological phase transition - namely, the closing and reopening of the superconducting gap - is mostly unobserved in previous experiments. Here, this phenomenon is reported in planar Josephson junction devices made from superconductor-semiconductor hybrid materials. Consistency between experiment and numerics, along with a number of other characteristic signatures, including dependence on phase, magnetic field, and chemical potential, support the conclusion that the observed gap closing and reopening, with associated appearance of a zero-bias conductance peaks upon reopening, are associated with topological transition.

[Phys. Rev. B 107, 245304] Published Thu Jun 22, 2023

X-ray holography of skyrmionic cocoons in aperiodic magnetic multilayers
M. Grelier, F. Godel, A. Vecchiola, S. Collin, K. Bouzehouane, V. Cros, N. Reyren, R. Battistelli, H. Popescu, C. Léveillé, N. Jaouen, and F. Büttner
Author(s): M. Grelier, F. Godel, A. Vecchiola, S. Collin, K. Bouzehouane, V. Cros, N. Reyren, R. Battistelli, H. Popescu, C. Léveillé, N. Jaouen, and F. Büttner

The development and characterization of three-dimensional topological magnetic textures has become an important topic in modern magnetism from both fundamental and technological perspectives. Here, the authors stabilize skyrmionic cocoons by engineering the properties of Pt/Co/Al based multilayers with variable Co thickness. These new textures can be observed in transmission with x-ray holography. Their coexistence with skyrmion tubes is particularly interesting as they can open new paths for three-dimensional spintronics.

[Phys. Rev. B 107, L220405] Published Thu Jun 22, 2023

Thermal Hall conductivity near field-suppressed magnetic order in a Kitaev-Heisenberg model
Aman Kumar and Vikram Tripathi
Author(s): Aman Kumar and Vikram Tripathi

Historically, analytical treatments for the thermal Hall effect of many-body systems have been based around an underlying quasiparticle assumption. The authors introduce here a new purification-based tensor network method for the thermal Hall response of gapped systems, making no prior quasiparticle assumption. Motivated by reports of half-quantized thermal Hall response of Kitaev materials near field-suppressed magnetic order, the authors calculate the thermal Hall response in this parameter regime and find that it is large, but non-universal, ruling out the possibility of a revival of Ising topological order and a Majorana Hall state through this route.

[Phys. Rev. B 107, L220406] Published Thu Jun 22, 2023

Found 6 papers in prl
Date of feed: Fri, 23 Jun 2023 03:16:59 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]+)

Dynamical Inflaton Coupled to Strongly Interacting Matter
Christian Ecker, Elias Kiritsis, and Wilke van der Schee
Author(s): Christian Ecker, Elias Kiritsis, and Wilke van der Schee

According to the inflationary theory of cosmology, most elementary particles in the current Universe were created during a period of reheating after inflation. In this Letter, we self-consistently couple the Einstein-inflaton equations to a strongly coupled quantum field theory as described by holog…

[Phys. Rev. Lett. 130, 251001] Published Thu Jun 22, 2023

Record High 36 K Transition Temperature to the Superconducting State of Elemental Scandium at a Pressure of 260 GPa
Jianjun Ying, Shiqiu Liu, Qing Lu, Xikai Wen, Zhigang Gui, Yuqing Zhang, Xiaomeng Wang, Jian Sun, and Xianhui Chen
Author(s): Jianjun Ying, Shiqiu Liu, Qing Lu, Xikai Wen, Zhigang Gui, Yuqing Zhang, Xiaomeng Wang, Jian Sun, and Xianhui Chen

Elemental materials provide clean and fundamental platforms for studying superconductivity. However, the highest superconducting critical temperature (${T}_{c}$) yet observed in elements has not exceeded 30 K. Discovering elemental superconductors with a higher ${T}_{c}$ is one of the most fundament…

[Phys. Rev. Lett. 130, 256002] Published Thu Jun 22, 2023

Multiversality and Unnecessary Criticality in One Dimension
Abhishodh Prakash, Michele Fava, and S. A. Parameswaran
Author(s): Abhishodh Prakash, Michele Fava, and S. A. Parameswaran

Two new concepts, multiversality and unnecessary criticality, useful for the quantum field theoretic description of topological properties, have been demonstrated using one-dimensional quantum spin systems.

[Phys. Rev. Lett. 130, 256401] Published Thu Jun 22, 2023

Confinement of Fractional Excitations in a Triangular Lattice Antiferromagnet
L. Facheris, S. D. Nabi, A. Glezer Moshe, U. Nagel, T. Rõõm, K. Yu. Povarov, J. R. Stewart, Z. Yan, and A. Zheludev
Author(s): L. Facheris, S. D. Nabi, A. Glezer Moshe, U. Nagel, T. Rõõm, K. Yu. Povarov, J. R. Stewart, Z. Yan, and A. Zheludev

High-resolution neutron and THz spectroscopies are used to study the magnetic excitation spectrum of ${\mathrm{Cs}}_{2}{\mathrm{CoBr}}_{4}$, a distorted-triangular-lattice antiferromagnet with nearly $XY$-type anisotropy. What was previously thought of as a broad excitation continuum [L. Facheris et…

[Phys. Rev. Lett. 130, 256702] Published Thu Jun 22, 2023

Spin-Derived Electric Polarization and Chirality Density Inherent in Localized Electron Orbitals
Shintaro Hoshino, Michi-To Suzuki, and Hiroaki Ikeda
Author(s): Shintaro Hoshino, Michi-To Suzuki, and Hiroaki Ikeda

The relation between the spin current tensor, electric toroidal multipole, and chirality based on a relativistic quantum mechanical formalism, shows that the spin-derived polarization associated with the spin current tensor serves as a fundamental physical quantity that characterizes electric toroidal multipoles.

[Phys. Rev. Lett. 130, 256801] Published Thu Jun 22, 2023

Giant Bulk Electrophotovoltaic Effect in Heteronodal-Line Systems
Xiao Jiang, Lei Kang, Jianfeng Wang, and Bing Huang
Author(s): Xiao Jiang, Lei Kang, Jianfeng Wang, and Bing Huang

First-principles model calculations predict a large tunable photovoltaic effect in electric-field-biased bilayers made of heteronodal-line systems, such as HSnN-MoS2 bilayers.

[Phys. Rev. Lett. 130, 256902] Published Thu Jun 22, 2023

Found 1 papers in prx
Date of feed: Fri, 23 Jun 2023 03:16:59 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]+)

Emergence of Geometric Turing Patterns in Complex Networks
Jasper van der Kolk, Guillermo García-Pérez, Nikos E. Kouvaris, M. Ángeles Serrano, and Marián Boguñá
Author(s): Jasper van der Kolk, Guillermo García-Pérez, Nikos E. Kouvaris, M. Ángeles Serrano, and Marián Boguñá

By describing network topology using an underlying geometric space, spatial Turing patterns can be found in the geometric embeddings of real networks.

[Phys. Rev. X 13, 021038] Published Thu Jun 22, 2023

Found 2 papers in pr_res
Date of feed: Fri, 23 Jun 2023 03:16:57 GMT

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

Trion states and quantum criticality of attractive SU(3) Dirac fermions
Han Xu, Xiang Li, Zhichao Zhou, Xin Wang, Lei Wang, Congjun Wu, and Yu Wang
Author(s): Han Xu, Xiang Li, Zhichao Zhou, Xin Wang, Lei Wang, Congjun Wu, and Yu Wang

We perform the projector quantum Monte Carlo (QMC) simulation to study the trion formation and quantum phase transition in the half filled attractive SU(3) Hubbard model on a honeycomb lattice. With increasing attractive Hubbard interaction, our simulations demonstrate a continuous quantum phase tra…

[Phys. Rev. Research 5, 023180] Published Thu Jun 22, 2023

Magnetic fragmentation and fractionalized Goldstone modes in a bilayer quantum spin liquid
Aayush Vijayvargia, Emilian Marius Nica, Roderich Moessner, Yuan-Ming Lu, and Onur Erten
Author(s): Aayush Vijayvargia, Emilian Marius Nica, Roderich Moessner, Yuan-Ming Lu, and Onur Erten

The coexistence of local and topological order, known as magnetic fragmentation, is observed in a bilayer Kitaev-type spin-orbital model. One of the low-energy excitations in this phase is shown to be a fractionalized Goldstone boson.

[Phys. Rev. Research 5, L022062] Published Thu Jun 22, 2023

Found 4 papers in nano-lett
Date of feed: Fri, 23 Jun 2023 01:00:50 GMT

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

[ASAP] Reduced Absorption Due to Defect-Localized Interlayer Excitons in Transition-Metal Dichalcogenide–Graphene Heterostructures
Daniel Hernangómez-Pérez, Amir Kleiner, and Sivan Refaely-Abramson

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01182

[ASAP] Mobility Enhancement in CVD-Grown Monolayer MoS2 Via Patterned Substrate-Induced Nonuniform Straining
Arijit Kayal, Sraboni Dey, Harikrishnan G., Renjith Nadarajan, Shashwata Chattopadhyay, and Joy Mitra

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01774

[ASAP] High Magnetic Field Stability in a Planar Graphene-NbSe2 SQUID
Ayelet Zalic, Takashi Taniguchi, Kenji Watanabe, Snir Gazit, and Hadar Steinberg

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01552

[ASAP] Controlling Valley-Specific Light Emission from Monolayer MoS2 with Achiral Dielectric Metasurfaces
Yin Liua, Sze Cheung Laub, Wen-Hui Chengc, Amalya Johnsona, Qitong Lia, Emma Simmermanb, Ouri Karnibe, Jack Hua, Fang Liud, Mark L. Brongersmaa, Tony F. Heinzbe, and Jennifer A. Dionnea

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01630

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]+)

The experimental demonstration of a topological current divider
< author missing >

Found 1 papers in scipost

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

Frequency-independent Optical Spin Injection in Weyl Semimetals, by Yang Gao; Chong Wang; Di Xiao
< author missing >
Submitted on 2023-06-22, refereeing deadline 2023-07-21.