Found 45 papers in cond-mat
Date of feed: Fri, 08 Sep 2023 00:30:00 GMT

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Nodal topological superconductivity in nodal-line semimetals. (arXiv:2309.03285v1 [cond-mat.supr-con])
Zhenfei Wu, Yuxuan Wang

We analyze possible nodal superconducting phases that emerge from a doped nodal-line semimetal. We show that nodal-line superconducting phases are favored by interactions mediated by short-range ferromagnetic fluctuations or Hund's coupling. It is found that the leading pairing channels are momentum-independent, orbital-singlet and spin-triplet. In the pairing state, we show that the Bogoliubov-de Gennes (BdG) Hamiltonian hosts a pair of topologically protected nodal rings on the equators of the torus Fermi surface (FS). Using a topological classification for gapless systems with inversion symmetry, we find that these nodal rings are topologically nontrivial and protected by integer-valued monopole charges $\nu = \pm 2$. In the scenario of pairing driven by ferromagnetic fluctuations, we analyze the fate of superconductivity in the magnetically ordered phase. Based on Ginzburg-Landau free energy analysis, we find the energetically favored superconducting state is characterized by the coexistence of two pairing orders whose $\bf d$-vectors are perpendicular to the magnetization axis $\bf M$ with their phases unfixed. In this case, each nodal loop in the pairing state splits into two, carrying a $\pm 1$ monopole charge. For bulk-boundary correspondence, these nodal rings enclose flat-band Majorana zero modes on top and bottom surface Brillouin Zones with distinct $\mathbb{Z}$-valued topological invariants.

Diffusion in superfluid Fermi mixtures: General formalism. (arXiv:2309.03313v1 [astro-ph.HE])
Oleg A. Goglichidze, Mikhail E. Gusakov

With neutron star applications in mind, we developed a theory of diffusion in mixtures of superfluid, strongly interacting Fermi liquids. By employing the Landau theory of Fermi liquids, we determined matrices that relate the currents of different particle species, their momentum densities, and the partial entropy currents to each other. Using these results, and applying the quasiclassical kinetic equation for the Bogoliubov excitations, we derived general expressions for the diffusion coefficients, which properly incorporate all the Fermi liquid effects and depend on the momentum transfer rates between different particle species. The developed framework can be used as a starting point for systematic calculations of the diffusion coefficients (as well as other kinetic coefficients) in superfluid Fermi mixtures, particularly, in superfluid neutron stars.

Topological Mixed Valence Model in Magic-Angle Twisted Bilayer Graphene. (arXiv:2309.03416v1 [cond-mat.supr-con])
Yantao Li, Benjamin M. Fregoso, Maxim Dzero

We develop a model to describe the mixed valence regime in magic-angle twisted bilayer graphene (MATBG) using the recently developed heavy-fermion framework. By employing the large-$N$ slave-boson approach, we derive the self-consistent mean field equations and solve them numerically. We find that the SU(8) symmetry constraint moir\'e system exhibits novel mixed-valence properties which are different from conventional heavy-fermions systems. We find the solutions describing the physics at the filling near the Mott insulator regime in the limit of strong Coulomb interactions between the flat-band fermions. Our model can provide additional insight into the possible microscopic origin of unconventional superconductivity in MATBG.

Quantized Hall conductance in graphene by nonperturbative magnetic-field-containing relativistic tight-binding approximation method. (arXiv:2309.03444v1 [cond-mat.mes-hall])
Md. Abdur Rashid, Masahiko Higuchi, Katsuhiko Higuch

In this study, we conducted a numerical investigation on the Hall conductance ($\sigma_{Hall}$) of graphene based on the magnetic energy band structure calculated using a nonperturbative magnetic-field-containing relativistic tight-binding approximation (MFRTB) method. The nonperturbative MFRTB can revisit two types of plateaus for the dependence of $\sigma_{Hall}$ on Fermi energy. One set is characterized as wide plateaus (WPs). These WPs have filling factors (FFs) of 2, 6, 10, 14, etc. and are known as the half-integer quantum Hall effect. The width of WPs decreases with increasing FF, which exceeds the decrease expected from the linear dispersion relation of graphene. The other set is characterized by narrow plateaus (NPs), which have FFs of 0, 4, 8, 12, etc. The NPs correspond to the energy gaps caused by the spin-Zeeman effect and spin-orbit interaction. Furthermore, it was discovered that the degeneracy of the magnetic energy bands calculated using the nonperturbative MFRTB method leads to a quantized $\sigma_{Hall}$.

Transition metal single-atom anchored on MoSi2N4 monolayer as highly efficient electrocatalyst for hydrogen evolution reaction. (arXiv:2309.03460v1 [cond-mat.mtrl-sci])
Wei Xun, Xin Liu, Qing-Song Jiang, Xiao Yang, Yin-Zhong Wu, Ping Li

Single-atom catalysts are considered as a promising method for efficient energy conversion, owing to their advantages of high atom utilization and low catalyst cost. However, finding a stable two-dimensional structure and high hydrogen evolution reaction (HER) performance is a current research hotspot. Herein, based on the first-principles calculations, we identify the HER properties of six catalysts (TM@MoSi2N4, TM = Sc, Ti, V, Fe, Co, and Ni) comprising transition metal atoms anchored on MoSi2N4 monolayer. The results show that the spin-polarized states appear around the Fermi level after anchoring TM atoms. Therefore, the energy level of the first available unoccupied state for accommodating hydrogen drops, regulating the bonding strength of hydrogen. Thus, the single transition metal atom activates the active site of the MoSi2N4 inert base plane, becoming a quite suitable site for the HER. Based on {\Delta}GH*, the exchange current density and volcano diagram of the corresponding catalytic system were also calculated. Among them, V@MoSi2N4 ({\Delta}GH* = -0.07 eV) and Ni@MoSi2N4 ({\Delta}GH* = 0.06 eV) systems show efficient the HER property. Our study confirms that the transition metal atom anchoring is an effective means to improve the performance of electrocatalysis, and TM@MoSi2N4 has practical application potential as a high efficiency HER electrocatalyst.

Laws of Physics. (arXiv:2309.03484v1 [physics.hist-ph])
Eddy Keming Chen

Despite its apparent complexity, our world seems to be governed by simple laws of physics. This volume provides a philosophical introduction to such laws. I explain how they are connected to some of the central issues in philosophy, such as ontology, possibility, explanation, induction, counterfactuals, time, determinism, and fundamentality. I suggest that laws are fundamental facts that govern the world by constraining its physical possibilities. I examine three hallmarks of laws--simplicity, exactness, and objectivity--and discuss whether and how they may be associated with laws of physics.

Topological Quantum Materials for Energy Conversion and Storage. (arXiv:2309.03488v1 [cond-mat.mtrl-sci])
Huixia Luo, Peifeng Yu, Guowei Li, Kai Yan

Topological quantum materials (TQMs) have symmetry protected band structures with useful electronic properties that have applications in information, sensing, energy, and other technologies. In the past 10 years, the applications of TQMs in the field of energy conversion and storage mainly including water splitting, ethanol electro-oxidation, battery, supercapacitor, and relative energy-efficient devices have attracted increasing attention. The novel quantum states in TQMs provide a stable electron bath with high conductivity and carrier mobility, long lifetime, and determined spin states, making TQMs an ideal platform for understanding the surface reactions and looking for highly efficient materials for energy conversion and storage. In this Perspective, we present an overview of the recent progress regarding topological quantum catalysis. We describe the open problems, and the potential applications of TQMs in water splitting, batteries, supercapacitors, and other prospects in energy conversion and storage.

Nonreciprocal phonon dichroism induced by Fermi pocket anisotropy in two-dimensional Dirac materials. (arXiv:2309.03540v1 [cond-mat.mes-hall])
Wen-Yu Shan

Electrons in two-dimensional (2D) Dirac materials carry local band geometric quantities, such as the Berry curvature and orbital magnetic moments, which, combined with electron-phonon coupling, may affect the phonon dynamics in an unusual way. Here, we propose intrinsic nonreciprocal linear and circular phonon dichroism in magnetic 2D Dirac materials, which originate from nonlocal band geometric quantities of electrons and reduce to pure Fermi-surface properties for acoustic phonons. We find that to acquire the nonreciprocity, the Fermi pocket anisotropy rather than the chirality of electrons is crucial. Two possible mechanisms of Fermi pocket anisotropy are suggested: (i) trigonal warping and out-of-plane magnetization or (ii) Rashba spin-orbit interaction and in-plane magnetization. As a concrete example, we predict appreciable and tunable nonreciprocal phonon dichroism in 2H-MoTe 2 on a EuO substrate. Our finding points to a different route towards electrical control of phonon nonreciprocity for acoustoelectronics applications based on 2D quantum materials.

Strong coupling between WS$_2$ monolayer excitons and a hybrid plasmon polariton at room temperature. (arXiv:2309.03560v1 [cond-mat.mes-hall])
Yuhao Zhang, Hans-Joachim Schill, Stephan Irsen, Stefan Linden

Light-matter interactions in solid-state systems have attracted considerable interest in recent years. Here, we report on a room-temperature study on the interaction of tungsten disulfide (WS$_2$) monolayer excitons with a hybrid plasmon polariton (HPP) mode supported by nanogroove grating structures milled into single-crystalline silver flakes. By engineering the depth of the nanogroove grating, we can modify the HPP mode at the A-exciton energy from propagating surface plasmon polariton-like (SPP-like) to localized surface plasmon resonance-like (LSPR-like). Using reflection spectroscopy, we demonstrate strong coupling between the A-exciton mode and the lower branch of the HPP for a SPP-like configuration with a Rabi splitting of 68 meV. In contrast, only weak coupling between the constituents is observed for LSPR-like configurations. These findings demonstrate the importance to consider both the plasmonic near-field enhancement and the plasmonic damping during the design of the composite structure since a possible benefit from increasing the coupling strength can be easily foiled by larger damping.

Spinor-dominated magnetoresistance driven by the topological phase transition in $\beta $-Ag$_2$Se. (arXiv:2309.03568v1 [cond-mat.mes-hall])
Cheng-Long Zhang, Yilin Zhao, Yiyuan Chen, Ziquan Lin, Sen Shao, Zhen-Hao Gong, Junfeng Wang, Hai-Zhou Lu, Guoqing Chang, Shuang Jia

A topological insulator is a quantum material which possesses conducting surfaces and an insulating bulk. Despite extensive researches on the properties of Dirac surface states, the characteristics of bulk states have remained largely unexplored. Here we report the observation of spinor-dominated magnetoresistance anomalies in the topological insulator $\beta $-Ag$_2$Se, induced by a magnetic-field-driven band topological phase transition. These anomalies are caused by intrinsic orthogonality in the wave-function spinors of the last Landau bands of the bulk states, in which backscattering is strictly forbidden during a band topological phase transition. This new type of longitudinal magnetoresistance, purely controlled by the wave-function spinors of the last Landau bands, highlights a unique signature of electrical transport around the band topological phase transition. With further reducing the quantum limit and gap size in $\beta $-Ag$_2$Se, our results may also suggest possible device applications based on this spinor-dominated mechanism and signify a rare case where topology enters the realm of magnetoresistance control.

Magnetization reversal in Fe(001) films grown by magnetic field assisted molecular beam epitaxy. (arXiv:2309.03583v1 [cond-mat.mtrl-sci])
B. Blyzniuk, A. Dziwoki, K. Freindl, A. Kozioł-Rachwał, E. Madej, E. Młyńczak, M. Szpytma, D. Wilgocka-Ślezak, J. Korecki, N. Spiridis

We studied the influence of a magnetic field (MF) on epitaxial growth and magnetic properties of Fe(001) films deposited on MgO(001). Thanks to modular sample holders and a specialized manipulator in our multi-chamber ultrahigh vacuum system, the films could be deposited and annealed in an in-plane MF of 100 mT. In situ scanning tunnelling microscopy showed that MF had a strong influence on the film morphology, and, in particular, on the structure of surface steps. The magnetic properties were studied ex situ using magneto-optic Kerr effect (MOKE) magnetometry and microscopy. We showed that the moderate in-plane magnetic field applied during growth has the visible impact on the magnetic properties. The observed angular dependence of the MOKE loops and domain structures were discussed based on a magnetization reversal model. In particular we found that magnetization reversal occurs via 90{\deg} domains and the reversal differs for the no-field and in-field grown samples, in correlation with the film morphology.

Conduction modulation of solution-processed two-dimensional materials. (arXiv:2309.03609v1 [])
Songwei Liu, Xiaoyue Fan, Yingyi Wen, Pengyu Liu, Yang Liu, Jingfang Pei, Wenchen Yang, Lekai Song, Danmei Pan, Teng Ma, Yue Lin, Gang Wang, Guohua Hu

Solution-processed two-dimensional (2D) materials hold promise for their scalable applications. However, the random, fragmented nature of the solution-processed nanoflakes and the poor percolative conduction through their discrete networks limit the performance of the enabled devices. To overcome the problem, we report conduction modulation of the solution-processed 2D materials via the Stark effect. Using liquid-phase exfoliated molybdenum disulfide (MoS2) as an example, we demonstrate nonlinear conduction modulation with a switching ratio of >105 by the local fields from the interfacial ferroelectric P(VDF-TrFE). Through density-functional theory calculations and in situ Raman scattering and photoluminescence spectroscopic analysis, we understand the modulation arises from a charge redistribution in the solution-processed MoS2. Beyond MoS2, we show the modulation may be viable for the other solution-processed 2D materials and low-dimensional materials. The effective modulation can open their electronic device applications.

Doping of large amount tetravalent Ge ions into Fe2O3 structure and experimental results on modified structural, optical and electronic properties. (arXiv:2309.03634v1 [cond-mat.mtrl-sci])
Divya Sherin G T, R.N Bhowmik

We report the doping high concentration of tetravalent Ge4+ ions (5 mol % for x = 0.05 to 30 mol % for x = 0.30) at the Fe3+ sites of Fe2-xGexO3 system by chemical coprecipitation route. The charge state of Fe and Ge ions has been modified into lower values, in addition to their normal +3 and +4 states, to stabilize the rhombohedral phase of hematite ({\alpha}-Fe2O3) structure. X-ray photoelectron spectra and optical band gap measurements indicated a combination of ionic and covalence character of metal-oxygen bonds as an effect of Ge doping in hematite structure. The Ge doped hematite samples have exhibited wide band gap semiconductor properties with band gap 4.50-4.70 eV and remarkably enhanced electrical conductivity ({\sigma} ~ 10-4 S/m) in comparison to {\alpha}-Fe2O3 (10-11 S/m). The thermo-conductivity measurements using warming and cooling modes showed a highly irreversible feature in the semiconductor regime at higher temperatures. Some of the samples indicated metal-like state at lower temperature, in addition to semiconductor state. Our experimental results confirmed the strategy of enhancing electrical conductivity by doping tetravalent ions in hematite structure. It has been understood that combination of ionic and covalence character of the metal-oxygen bonds has played an important role in modifying the semiconductor properties in Ge doped Fe2O3 system.

Interaction between giant atoms in a one-dimensional topological waveguide. (arXiv:2309.03663v1 [quant-ph])
Da-Wei Wang, Chengsong Zhao, Junya Yang, Ye-Ting Yan, Zhihai-Wang Ling Zhou

We study giant atoms coupled to a one-dimensional topological waveguide reservoir. Under the Born-Markov approximation, we obtained practical coherence and correlated dissipative interactions between giant atoms mediated by topological waveguide reservoirs, which depend on the topological phase in the topological waveguide. In the bandgap regime, only coherent interactions exist and decay exponentially with distance, corresponding to photon-bound states' appearance and the photon distribution's exponential decay. Then, we discuss the appearance of photon-bound states when the frequencies of the giant atoms lie in different band gaps. A chiral photon distribution occurs when the giant atoms coupled to two sub-lattice points differ in intensity and resonate with the waveguide, which stems from the fact that the photon-bound state can be considered as a topological edge state, which is insensitive to off-diagonal disorder. Finally, we find that for the same bandgap width, the excitation transfer rate is faster in topological phases than in trivial phases. Our work will promote the study of topological matter coupled to giant atoms.

Detecting Hidden Order in Fractional Chern Insulators. (arXiv:2309.03666v1 [cond-mat.quant-gas])
Fabian J. Pauw, Felix A. Palm, Ulrich Schollwöck, Annabelle Bohrdt, Sebastian Paeckel, Fabian Grusdt

Topological phase transitions go beyond Ginzburg and Landau's paradigm of spontaneous symmetry breaking and occur without an associated local order parameter. Instead, such transitions can be characterized by the emergence of non-local order parameters, which require measurements on extensively many particles simultaneously - an impossible venture in real materials. On the other hand, quantum simulators have demonstrated such measurements, making them prime candidates for an experimental confirmation of non-local topological order. Here, building upon the recent advances in preparing few-particle fractional Chern insulators using ultracold atoms and photons, we propose a realistic scheme for detecting the hidden off-diagonal long-range order (HODLRO) characterizing Laughlin states. Furthermore, we demonstrate the existence of this hidden order in fractional Chern insulators, specifically for the $\nu=\frac{1}{2}$-Laughlin state in the isotropic Hofstadter-Bose-Hubbard model. This is achieved by large-scale numerical density matrix renormalization group (DMRG) simulations based on matrix product states, for which we formulate an efficient sampling procedure providing direct access to HODLRO in close analogy to the proposed experimental scheme. We confirm the characteristic power-law scaling of HODLRO, with an exponent $\frac{1}{\nu} = 2$, and show that its detection requires only a few thousand snapshots. This makes our scheme realistically achievable with current technology and paves the way for further analysis of non-local topological orders, e.g. in topological states with non-Abelian anyonic excitations.

Ultraviolet-ozone treatment: an effective method for fine-tuning optical and electrical properties of suspended and substrate-supported MoS2. (arXiv:2309.03679v1 [cond-mat.mtrl-sci])
Fahrettin Sarcan, Alex J. Armstrong, Yusuf K. Bostan, Esra Kus, Keith McKenna, Ayse Erol, Yue Wang

Ultraviolet-ozone (UV-O3) treatment is a simple but effective technique for surface cleaning, surface sterilization, doping and oxidation, and is applicable to a wide range of materials. In this study, we investigated how UV-O3 treatment affects the optical and electrical properties of molybdenum disulfide (MoS2), with and without the presence of a dielectric substrate. We performed detailed photoluminescence (PL) measurements on 1-7 layers of MoS2 with up to 8 minutes of UV-O3 exposure. Density functional theory (DFT) calculations were carried out to provide insight into oxygen-MoS2 interaction mechanisms. Our results showed that the influence of UV-O3 treatment on PL depends on whether the substrate is present, as well as the number of layers. The PL intensity of the substrate-supported MoS2 decreased dramatically with the increase of UV-O3 treatment time and was fully quenched after 8 mins. However, the PL intensity of the suspended flakes was less affected. 4 minutes of UV-O3 exposure was found to be optimal to produce p-type MoS2, while maintaining above 80% of the PL intensity and the emission wavelength, compared to pristine flakes (intrinsically n-type). Our electrical measurements showed that UV-O3 treatment for more than 6 minutes not only caused a reduction in the electron density but also deteriorated the hole-dominated transport. It is revealed that the substrate plays a critical role in the manipulation of the electrical and optical properties of MoS2, which should be considered in future device fabrication and applications.

Higher-order topological phases in crystalline and non-crystalline systems: a review. (arXiv:2309.03688v1 [cond-mat.mes-hall])
Yan-Bin Yang, Jiong-Hao Wang, Kai Li, Yong Xu

In recent years, higher-order topological phases have attracted great interest in various fields of physics. These phases have protected boundary states at lower-dimensional boundaries than the conventional first-order topological phases due to the higher-order bulk-boundary correspondence. In this review, we summarize current research progress on higher-order topological phases in both crystalline and non-crystalline systems. We firstly introduce prototypical models of higher-order topological phases in crystals and their topological characterizations. We then discuss effects of quenched disorder on higher-order topology and demonstrate disorder-induced higher-order topological insulators. We also review the theoretical studies on higher-order topological insulators in amorphous systems without any crystalline symmetry and higher-order topological phases in nonperiodic lattices including quasicrystals and hyperbolic lattices, which have no crystalline counterparts. We conclude the review by a summary of experimental realizations of higher-order topological phases and discussions on potential directions for future study.

Statics and Dynamics of Skyrmions in Balanced and Unbalanced Synthetic Antiferromagnets. (arXiv:2309.03697v1 [cond-mat.mes-hall])
Eloi Haltz, Christopher E. A. Barker, Christopher H. Marrows

Synthetic antiferromagnets have great potential as skyrmion carriers in which new properties are expected for these spin textures, owing to changed magnetostatics and the absence of net topological charge. Here we numerically simulate the static and dynamic behaviour of skyrmions in these systems and clearly highlight the benefits compared to ferromagnetic single layers. In particular, our results show a reduction of the skyrmion radius, an increase of their velocity under current, and a vanishing of their topological deflection. We also provide a robust and straightforward analytical model that captures the physics of such skyrmions. Finally, by extending the model to the case of an unbalanced SAF, we show some conditions for the system that optimise the properties of the skyrmion for potential spintronic devices.

Quantum Transport on the Surfaces of Topological Nodal-line Semimetals. (arXiv:2309.03699v1 [cond-mat.mes-hall])
Jun-Jie Fu, Shu-Tong Guan, Jiao Xie, Jin An

Topological nodal-line semimetals are always characterized by the drumhead surface states at the open boundaries. In this paper we first derive an analytical expression for the surface Green's function of a nodal-line semimetal. By making use of this result, we explore the charge and spin transport properties of a metallic chain on the surface of a nodal-line semimetal, as functions of the gate voltage applied on the top of the material. According to the size of the nodal loop, due to the coupling to the surface modes, the charge conductance in the chain is found to show a robust plateau at $e^{2}/h$, or to exhibit multiple valleys at $e^{2}/h$. Correspondingly, the spin polarization of the transmitted current is $100\%$ at the plateau region, or exhibits multiple peaks at nearly $100\%$. This feature can be viewed as a transport signature of the topological nodal-line semimetals.

Coherent spin dynamics between electron and nucleus within a single atom. (arXiv:2309.03749v1 [cond-mat.mes-hall])
Lukas M. Veldman, Evert W. Stolte, Mark P. Canavan, Rik Broekhoven, Philip Willke, Laëtitia Farinacci, Sander Otte

The nuclear spin, being much more isolated from the environment than its electronic counterpart, enables quantum experiments with prolonged coherence times and presents a gateway towards uncovering the intricate dynamics within an atom. These qualities have been demonstrated in a variety of nuclear spin qubit architectures, albeit with limited control over the direct environment of the nuclei. As a contrasting approach, the combination of electron spin resonance (ESR) and scanning tunnelling microscopy (STM) provides a bottom-up platform to study the fundamental properties of nuclear spins of single atoms on a surface. However, access to the time evolution of these nuclear spins, as was recently demonstrated for electron spins, remained a challenge. Here, we present an experiment resolving the nanosecond coherent dynamics of a hyperfine-driven flip-flop interaction between the spin of an individual nucleus and that of an orbiting electron. We use the unique local controllability of the magnetic field emanating from the STM probe tip to bring the electron and nuclear spins in tune, as evidenced by a set of avoided level crossings in ESR-STM. Subsequently, we polarize both spins through scattering of tunnelling electrons and measure the resulting free evolution of the coupled spin system using a DC pump-probe scheme. The latter reveals a complex pattern of multiple interfering coherent oscillations, providing unique insight into the atom's hyperfine physics. The ability to trace the coherent hyperfine dynamics with atomic-scale structural control adds a new dimension to the study of on-surface spins, offering a pathway towards dynamic quantum simulation of low-dimensional magnonics.

Charge transfer and asymmetric coupling of MoSe$_2$ valleys to the magnetic order of CrSBr. (arXiv:2309.03766v1 [cond-mat.mes-hall])
C. Serati de Brito (1 and 2), P. E. Faria Junior (3), T. S. Ghiasi (4), J. Ingla-Aynés (4), C. R. Rabahi (1), C. Cavalini (1), F. Dirnberger (5), S. Mañas-Valero (4 and 6), K. Watanabe (7), T. Taniguchi (7), K. Zollner (3), J. Fabian (3), C. Schüller (2), H. S. J. van der Zant (4), Y. Galvão Gobato (1). ((1) Physics Department, Federal University of São Carlos, Brazil, (2) Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany, (3) Institute of Theoretical Physics, University of Regensburg, Germany, (4) Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands, (5) Institute of Applied Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, Germany, (6) Instituto de Ciencia Molecular (ICMol), Universitat de València, Spain, (7) Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Japan.)

Van der Waals (vdW) heterostructures composed of two-dimensional (2D) transition metal dichalcogenides (TMD) and vdW magnetic materials offer an intriguing platform to functionalize valley and excitonic properties in non-magnetic TMDs. Here, we report magneto-photoluminescence (PL) investigations of monolayer (ML) MoSe$_2$ on the layered A-type antiferromagnetic (AFM) semiconductor CrSBr under different magnetic field orientations. Our results reveal a clear influence of the CrSBr magnetic order on the optical properties of MoSe$_2$, such as an anomalous linear-polarization dependence, changes of the exciton/trion energies, a magnetic-field dependence of the PL intensities, and a valley $g$-factor with signatures of an asymmetric magnetic proximity interaction. Furthermore, first principles calculations suggest that MoSe$_2$/CrSBr forms a broken-gap (type-III) band alignment, facilitating charge transfer processes. The work establishes that antiferromagnetic-nonmagnetic interfaces can be used to control the valley and excitonic properties of TMDs, relevant for the development of opto-spintronics devices.

Proposal for all-electrical skyrmion detection in van der Waals tunnel junctions. (arXiv:2309.03828v1 [cond-mat.mtrl-sci])
Dongzhe Li, Soumyajyoti Haldar, Stefan Heinze

Magnetic skyrmions in atomically thin van der Waals (vdW) materials provide an ideal playground to push skyrmion technology to the single-layer limit. However, a major challenge is reliable skyrmion detection. Here, we show, based on rigorous first-principles calculations, that all-electrical detection of skyrmions in two-dimensional (2D) vdW magnets is feasible via scanning tunneling microscopy as well as in planar tunnel junctions with straightforward implementation into device architectures. We use the nonequilibrium Green's function method for quantum transport in planar junctions, including self-energy due to electrodes and working conditions, going beyond the standard Tersoff-Hamann approximation. An extremely large noncollinear magnetoresistance (NCMR) of above 10,000 % and a giant tunneling anisotropic magnetoresistance (TAMR) of 200 % are observed for a vdW tunnel junction based on graphite/Fe$_3$GeTe$_2$/germanene/graphite. The NCMR is more than two orders of magnitude higher than that obtained for conventional transition-metal interfaces. We trace the origin of the NCMR to spin-mixing between spin-up and -down states of $p_z$ and $d_{z^2}$ character at the Fe and Te surface atoms and the orbital matching effect at the interface. Our work paves the way for all-electrical detection of skyrmionic spin textures in 2D vdW tunnel junctions.

Floquet analysis of a driven Kitaev chain in presence of a quasiperiodic potential. (arXiv:2309.03836v1 [cond-mat.mes-hall])
Koustav Roy, Shilpi Roy, Saurabh Basu

The interplay of topology and disorder in non-equilibrium quantum systems is an intriguing subject. Here, we look for a suitable platform that enables an in-depth exploration of the topic. To this end, We analyze the topological and localization properties of a dimerized one-dimensional Kitaev chain in the presence of an onsite quasiperiodic potential with its amplitude being modulated periodically in time. The topological features have been explored via computing the real-space winding numbers corresponding to both the Majorana zero and the $\pi$ energy modes. We enumerate the scenario at different driving frequencies. In particular, at some intermediate frequency regime, the phase diagram concerning the zero mode involves two distinct phase transitions, one from a topologically trivial to a non-trivial phase, and another from a topological phase to an Anderson localized phase. On the other hand, the study of the $\pi$ modes reveals the emergence of a unique topological phase, with the bulk and the edges being fully localized, which may be called as the Floquet topological Anderson phase. Furthermore, we study the localization properties of the bulk states by computing the inverse and normalized participation ratios, while the critical phase is ascertained by computing the fractal dimension. We have observed extended, critical, and localized phases at intermediate frequencies, which are further confirmed via a finite-size scaling analysis. Finally, fully extended and localized phases are respectively observed at lower and higher frequencies.

Hyperbolic lattices and two-dimensional Yang-Mills theory. (arXiv:2309.03857v1 [cond-mat.mes-hall])
G. Shankar, Joseph Maciejko

Hyperbolic lattices are a new type of synthetic quantum matter emulated in circuit quantum electrodynamics and electric-circuit networks, where particles coherently hop on a discrete tessellation of two-dimensional negatively curved space. While real-space methods and a reciprocal-space hyperbolic band theory have been recently proposed to analyze the energy spectra of those systems, discrepancies between the two sets of approaches remain. In this work, we reconcile those approaches by first establishing an equivalence between hyperbolic band theory and $U(N)$ topological Yang-Mills theory on higher-genus Riemann surfaces. We then show that moments of the density of states of hyperbolic tight-binding models correspond to expectation values of Wilson loops in the quantum gauge theory and become exact in the large-$N$ limit.

The $(2+\delta)$-dimensional theory of the electromechanics of lipid membranes: II. Balance laws. (arXiv:2309.03863v1 [cond-mat.soft])
Yannick A. D. Omar, Zachary G. Lipel, Kranthi K. Mandadapu

This article is the second of a three-part series that derives a self-consistent theoretical framework of the electromechanics of arbitrarily curved lipid membranes. Existing continuum theories commonly treat lipid membranes as strictly two-dimensional surfaces. While this approach is successful in many purely mechanical applications, strict surface theories fail to capture the electric potential drop across lipid membranes, the effects of surface charges, and electric fields within the membrane. Consequently, they do not accurately resolve Maxwell stresses in the interior of the membrane and its proximity. Furthermore, surface theories are generally unable to capture the effects of distinct velocities and tractions at the interfaces between lipid membranes and their surrounding bulk fluids. To address these shortcomings, we apply a recently proposed dimension reduction method to the three-dimensional, electromechanical balance laws. This approach allows us to derive an effective surface theory without taking the limit of vanishing thickness, thus incorporating effects arising from the finite thickness of lipid membranes. We refer to this effective surface theory as $(2 + \delta)$-dimensional, where $\delta$ indicates the thickness. The resulting $(2 + \delta)$-dimensional equations of motion satisfy velocity and traction continuity conditions at the membrane-bulk interfaces, capture the effects of Maxwell stresses, and can directly incorporate three-dimensional constitutive models.

Fate of Quadratic Band Crossing under quasiperiodic modulation. (arXiv:2309.03896v1 [cond-mat.dis-nn])
Raul Liquito, Miguel Gonçalves, Eduardo V. Castro

We study the fate of two-dimensional quadratic band crossing topological phases under a one-dimensional quasiperiodic modulation. By employing numerically exact methods, we fully characterize the phase diagram of the model in terms of spectral, localization and topological properties. Unlike in the presence of regular disorder, the quadratic band crossing is stable towards the application of the quasiperiodic potential and most of the topological phase transitions occur through a gap closing and reopening mechanism, as in the homogeneous case. With a sufficiently strong quasiperiodic potential, the quadratic band crossing point splits into Dirac cones which enables transitions into gapped phases with Chern numbers $C=\pm1$, absent in the homogeneous limit. This is in sharp contrast with the disordered case, where gapless $C=\pm1$ phases can arise by perturbing the band crossing with any amount of disorder. In the quasiperiodic case, we find that the $C=\pm1$ phases can only become gapless for a very strong potential. Only in this regime, the subsequent quasiperiodic-induced topological transitions into the trivial phase mirror the well-known ``levitation and annihilation'' mechanism in the disordered case.

Trion states and quantum criticality of attractive SU(3) Dirac fermions. (arXiv:1912.11233v3 [cond-mat.quant-gas] UPDATED)
Han Xu, Xiang Li, Zhichao Zhou, Xin Wang, Lei Wang, Congjun Wu, 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 transition from the semimetal to charge density wave (CDW) at the critical coupling $U_c/t=-1.52(2)$. The critical exponents $\nu=0.82(3)$ and $\eta=0.58(4)$ determined by the QMC simulation remarkably disagree with those of the $N=3$ chiral Ising universality class suggested by the effective Gross-Neveu-Yukawa (GNY) theory, but coincide with the $N=1$ chiral Ising universality class. In the CDW phase, we show that on-site and off-site trions coexist and the off-site trion forms a local bond state. Our work not only illustrates the formation of off-site trions in two-dimensional Hubbard model, but also raises doubts about the extent of applicability of GNY model on the attractive SU(3) Dirac fermions.

Symmetry-broken Chern insulators in twisted double bilayer graphene. (arXiv:2109.08255v2 [cond-mat.mes-hall] UPDATED)
Minhao He, Jiaqi Cai, Ya-Hui Zhang, Yang Liu, Yuhao Li, Takashi Taniguchi, Kenji Watanabe, David H. Cobden, Matthew Yankowitz, Xiaodong Xu

Twisted double bilayer graphene (tDBG) has emerged as an especially rich platform for studying strongly correlated and topological states of matter. The material features moir\'e bands that can be continuously deformed by both perpendicular displacement field and twist angle. Here, we construct a phase diagram representing of the correlated and topological states as a function of these parameters, based on measurements on over a dozen tDBG devices encompassing the two distinct stacking configurations in which the constituent Bernal bilayer graphene sheets are rotated either slightly away from 0{\deg} or 60{\deg}. We find a hierarchy of symmetry-broken states that emerge sequentially as the twist angle approaches an apparent optimal value of $\theta \approx$ 1.34{\deg}. Among them, we discover a sequence of symmetry-broken Chern insulator (SBCI) states that arise only within a narrow range of twist angles ($\approx$ 1.33{\deg} to 1.39{\deg}). We observe an associated anomalous Hall effect at zero field in all samples supporting SBCI states, indicating spontaneous time-reversal symmetry breaking and possible moir\'e unit cell enlargement at zero magnetic field.

Simulating Chern insulators on a superconducting quantum processor. (arXiv:2207.11797v2 [quant-ph] UPDATED)
Zhong-Cheng Xiang, Kaixuan Huang, Yu-Ran Zhang, Tao Liu, Yun-Hao Shi, Cheng-Lin Deng, Tong Liu, Hao Li, Gui-Han Liang, Zheng-Yang Mei, Haifeng Yu, Guangming Xue, Ye Tian, Xiaohui Song, Zhi-Bo Liu, Kai Xu, Dongning Zheng, Franco Nori, Heng Fan

The quantum Hall effect, fundamental in modern condensed matter physics, continuously inspires new theories and predicts emergent phases of matter. Here we experimentally demonstrate three types of Chern insulators with synthetic dimensions on a programable 30-qubit-ladder superconducting processor. We directly measure the band structures of the 2D Chern insulator along synthetic dimensions with various configurations of Aubry-Andr\'e-Harper chains and observe dynamical localisation of edge excitations. With these two signatures of topology, our experiments implement the bulk-edge correspondence in the synthetic 2D Chern insulator. Moreover, we simulate two different bilayer Chern insulators on the ladder-type superconducting processor. With the same and opposite periodically modulated on-site potentials for two coupled chains, we simulate topologically nontrivial edge states with zero Hall conductivity and a Chern insulator with higher Chern numbers, respectively. Our work shows the potential of using superconducting qubits for investigating different intriguing topological phases of quantum matter.

Exact Dirac-Bogoliubov-de Gennes Dynamics for Inhomogeneous Quantum Liquids. (arXiv:2208.14467v3 [cond-mat.stat-mech] UPDATED)
Per Moosavi

We study inhomogeneous 1+1-dimensional quantum many-body systems described by Tomonaga-Luttinger-liquid theory with general propagation velocity and Luttinger parameter varying smoothly in space, equivalent to an inhomogeneous compactification radius for free boson conformal field theory. This model appears prominently in low-energy descriptions, including for trapped ultracold atoms, while here we present an application to quantum Hall edges with inhomogeneous interactions. The dynamics is shown to be governed by a pair of coupled continuity equations identical to inhomogeneous Dirac-Bogoliubov-de Gennes equations with a local gap and solved by analytical means. We obtain their exact Green's functions and scattering matrix using a Magnus expansion, which generalize previous results for conformal interfaces and quantum wires coupled to leads. Our results explicitly describe the late-time evolution following quantum quenches, including inhomogeneous interaction quenches, and Andreev reflections between coupled quantum Hall edges, revealing a remarkably universal dependence on details at stationarity or at late times out of equilibrium.

Majorana corner states on the dice lattice. (arXiv:2210.09610v2 [cond-mat.supr-con] UPDATED)
Narayan Mohanta, Rahul Soni, Satoshi Okamoto, Elbio Dagotto

Lattice geometry continues providing exotic topological phases in condensed matter physics. Exciting recent examples are the higher-order topological phases, manifesting via localized lower-dimensional boundary states. Moreover, flat electronic bands with a non-trivial topology arise in various lattices and can hold a finite superfluid density, bounded by the Chern number $C$. Here we consider attractive interaction in the dice lattice that hosts flat bands with $C=\pm2$ and show that the induced superconducting state exhibits a second-order topological phase with mixed singlet-triplet pairing. The second-order nature of the topological superconducting phase is revealed by the zero-energy Majorana bound states at the lattice corners. Hence, the topology of the normal state dictates the nature of the Majorana localization. These findings suggest that flat bands with a higher Chern number provide feasible platforms for inducing higher-order topological superconductivity.

Exact emergent higher-form symmetries in bosonic lattice models. (arXiv:2301.05261v4 [cond-mat.str-el] UPDATED)
Salvatore D. Pace, Xiao-Gang Wen

Although condensed matter systems usually do not have higher-form symmetries, we show that, unlike 0-form symmetry, higher-form symmetries can emerge as exact symmetries at low energies and long distances. In particular, emergent higher-form symmetries at zero temperature are robust to arbitrary local UV perturbations in the thermodynamic limit. This result is true for both invertible and non-invertible higher-form symmetries. Therefore, emergent higher-form symmetries are exact emergent symmetries: they are not UV symmetries but constrain low-energy dynamics as if they were. Since phases of matter are defined in the thermodynamic limit, this implies that a UV theory without higher-form symmetries can have phases characterized by exact emergent higher-form symmetries. We demonstrate this in three lattice models, the quantum clock model and emergent $\mathbb{Z}_N$ and $U(1)$ ${p}$-gauge theory, finding regions of parameter space with exact emergent (anomalous) higher-form symmetries. Furthermore, we perform a generalized Landau analysis of a 2+1D lattice model that gives rise to $\mathbb{Z}_2$ gauge theory. Using exact emergent 1-form symmetries accompanied by their own energy/length scales, we show that the transition between the deconfined and Higgs/confined phases is continuous and equivalent to the spontaneous symmetry-breaking transition of a $\mathbb{Z}_2$ symmetry, even though the lattice model has no symmetry. Also, we show that this transition line must always contain two parts separated by multi-critical points or other phase transitions. We discuss the physical consequences of exact emergent higher-form symmetries and contrast them to emergent 0-form symmetries. Lastly, we show that emergent 1-form symmetries are no longer exact at finite temperatures, but emergent $p$-form symmetries with $p\geq 2$ are.

Block belief propagation algorithm for two-dimensional tensor networks. (arXiv:2301.05844v3 [quant-ph] UPDATED)
Chu Guo, Dario Poletti, Itai Arad

Belief propagation is a well-studied algorithm for approximating local marginals of multivariate probability distribution over complex networks, while tensor network states are powerful tools for quantum and classical many-body problems. Building on a recent connection between the belief propagation algorithm and the problem of tensor network contraction, we propose a block belief propagation algorithm for contracting two-dimensional tensor networks and approximating the ground state of $2D$ systems. The advantages of our method are three-fold: 1) the same algorithm works for both finite and infinite systems; 2) it allows natural and efficient parallelization; 3) given its flexibility it would allow to deal with different unit cells. As applications, we use our algorithm to study the $2D$ Heisenberg and transverse Ising models, and show that the accuracy of the method is on par with state-of-the-art results.

Weiss Oscillations in the Galilean-Invariant Dirac Composite Fermion Theory for Even-Denominator Filling Fractions of the Lowest Landau Level. (arXiv:2302.14076v2 [cond-mat.str-el] UPDATED)
Yen-Wen Lu, Prashant Kumar, Michael Mulligan

Standard field theoretic formulations of composite fermion theories for the anomalous metals that form at or near even-denominator filling fractions of the lowest Landau level do not possess Galilei invariance. To restore Galilei symmetry, these theories must be supplemented by "correction" terms. We study the effect of the leading "correction" term, known as the dipole term, in the Dirac composite fermion theory (a theory that consists of a Dirac fermion coupled to an Abelian Chern-Simons gauge field) on quantum oscillations in the electrical resistivity due to a periodic scalar potential about even-denominator filling fractions. We find the dipole term to be insufficient to resolve the systematic discrepancy, discovered in [Kamburov et. al., Phys. Rev. Lett. 113, 196801 (2014)], between the locations of the oscillation minima predicted by Dirac composite fermion theory without Galilei invariance and those observed in experiment. Further, in contrast to [Hossain et al., Phys. Rev. B 100, 041112 (2019)], we find the quantum oscillations about the half-filled and quarter-filled lowest Landau level to have qualitatively similar behavior. This analysis uses a mean-field approximation, in which gauge field fluctuations are neglected. Based on this and previous analyses, we speculate the discrepancy with experiment may be an indirect signature of the effect of gauge field fluctuations in composite fermion theory.

Self-interaction and transport of solvated electrons in molten salts. (arXiv:2305.10052v2 [physics.chem-ph] UPDATED)
Paolo Pegolo, Stefano Baroni, Federico Grasselli

The dynamics of (few) electrons dissolved in an ionic fluid--as when a small amount of metal is added to a solution while upholding its electronic insulation--manifests interesting properties that can be ascribed to nontrivial topological features of particle transport (e.g., Thouless' pumps). In the adiabatic regime, the charge distribution and the dynamics of these dissolved electrons are uniquely determined by the nuclear configuration. Yet, their localization into effective potential wells and their diffusivity are dictated by how the self-interaction is modeled. In this article, we investigate the role of self-interaction in the description of localization and transport properties of dissolved electrons in non-stoichiometric molten salts. Although the account for the exact (Fock) exchange strongly localizes the dissolved electrons, decreasing their tunneling probability and diffusivity, we show that the dynamics of the ions and of the dissolved electrons are largely uncorrelated, irrespective of the degree to which the electron self-interaction is treated, and in accordance with topological arguments.

Electrical conductivity and screening effect of spin-1 chiral fermions scattered by charged impurities. (arXiv:2305.11631v2 [cond-mat.mes-hall] UPDATED)
Risako Kikuchi, Ai Yamakage

We theoretically study the quantum transport in a three-dimensional spin-1 chiral fermion system in the presence of coulomb impurities based on the self-consistent Born approximation. We find that the flat-band states anomalously enhance the screening effect, and the electrical conductivity is increased in the low-energy region. It is also found that reducing the screening length leads to an increase in the forward scattering contribution and, thus, an increase in the vertex correction in the high-energy region.

Laser induced surface magnetization in Floquet-Weyl semimetals. (arXiv:2306.15522v2 [cond-mat.mtrl-sci] UPDATED)
Runnan Zhang, Ken-ichi Hino, Nobuya Maeshima, Haruki Yogemura, Takeru Karikomi

We investigate optically induced magnetization in Floquet-Weyl semimetals generated by irradiation of a circularly-polarized continuous-wave laser from the group II-V narrow gap semiconductor Zn$_3$As$_2$ in a theoretical manner. Here, this trivial and nonmagnetic crystal is driven by the laser with a nearly resonant frequency with a band gap to generate two types of Floquet-Weyl semimetal phases composed of different spin states. These two phases host nontrivial two-dimensional surface states pinned to the respective pairs of the Weyl points. By numerically evaluating the laser-induced transient carrier-dynamics, it is found that both spins are distributed in an uneven manner on the corresponding surface states due to significantly different excitation probabilities caused by the circularly-polarized laser with the nearly resonant frequency. It is likely that such spin-polarized surface states produce surface magnetization, and furthermore the inverse Faraday effect also contributes almost as much as the spin magnetization. To be more specific, excited carries with high density of the order of $10^{21}\: {\rm cm}^{-3}$ are generated by the laser with electric field strength of a few MV/cm to result in the surface magnetization that becomes asymptotically constant with respect to time, around 1 mT. The magnitude and the direction of it depend sharply on both of the intensity and frequency of the driving laser, which would be detected by virtue of the magneto-optic Kerr effect.

Design of Antiferromagnetic Second-order Band Topology with Rotation Topological Invariants in Two Dimensions. (arXiv:2307.06903v2 [cond-mat.mtrl-sci] UPDATED)
Fangyang Zhan, Zheng Qin, Dong-Hui Xu, Xiaoyuan Zhou, Da-Shuai Ma, Rui Wang

The existence of fractionally quantized topological corner states serves as a key indicator for two-dimensional second-order topological insulators (SOTIs), yet has not been experimentally observed in realistic materials. Here, based on effective model analysis and symmetry arguments, we propose a strategy for achieving SOTI phases with in-gap corner states in two dimensional systems with antiferromagnetic (AFM) order. We uncover by a minimum lattice model that the band topology originates from the interplay between intrinsic spin-orbital coupling and interlayer AFM exchange interactions. Using first principles calculations, we show that the 2D AFM SOTI phases can be realized in (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_{m}$ films. Moreover, we demonstrate that the nontrivial corner states are linked to rotation topological invariants under three-fold rotation symmetry $C_3$, resulting in $C_3$-symmetric SOTIs with corner charges fractionally quantized to $\frac{n}{3} \lvert e \rvert $ (mod $e$). Due to the great recent achievements in (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_{m}$ systems, our results providing reliable material candidates for experimentally accessible AFM higher-order band topology would draw intense attentions.

Two-Dimensional Moir\'e Polaronic Electron Crystals. (arXiv:2307.16563v2 [cond-mat.str-el] UPDATED)
Eric A. Arsenault, Yiliu Li, Birui Yang, Xi Wang, Heonjoon Park, Edoardo Mosconi, Enrico Ronca, Takashi Taniguchi, Kenji Watanabe, Daniel Gamelin, Andrew Millis, Cory R. Dean, Filippo de Angelis, Xiaodong Xu, X.-Y. Zhu

Two-dimensional moir\'e materials have emerged as the most versatile platforms for realizing quantum phases of electrons. Here, we explore the stability origins of correlated states in WSe2/WS2 moir\'e superlattices. We find that ultrafast electronic excitation leads to melting of the Mott states on time scales five times longer than predictions from the charge hopping integrals and the melting rates are thermally activated, with activation energies of 18 and 13 meV for the one- and two-hole Mott states, respectively, suggesting significant electron-phonon coupling. DFT calculation of the one-hole Mott state confirms polaron formation and yields a hole-polaron binding energy of 16 meV. These findings reveal a close interplay of electron-electron and electron-phonon interactions in stabilizing the polaronic Mott insulators at transition metal dichalcogenide moir\'e interfaces.

Honeycomb Layered Frameworks with Metallophilic Bilayers. (arXiv:2308.03809v2 [cond-mat.mtrl-sci] UPDATED)
Godwill Mbiti Kanyolo, Titus Masese, Yoshinobu Miyazaki, Shintaro Tachibana, Chengchao Zhong, Yuki Orikasa, Tomohiro Saito

Honeycomb layered frameworks with metallophilic bilayers have garnered traction in various disciplines due to their unique configuration and numerous physicochemical and topological properties, such as fast ionic conduction, coordination chemistry, and structural defects. These properties make them attractive for energy storage applications, leading to increased attention towards their metallophilic bilayer arrangements. This Review focuses on recent advancements in this field, including characterisation techniques like X-ray absorption spectroscopy and high-resolution transmission electron microscopy, particularly for silver-based oxides. It also highlights strategies related to cationic-deficient phases induced by topology or temperature, expanding the compositional space of honeycomb layered frameworks with a focus on cationic bilayer architectures. The Review further discusses theoretical approaches for understanding the bilayered structure, especially concerning critical phenomena at the monolayer-bilayer phase transition. Honeycomb layered frameworks are described as optimised lattices within the congruent sphere packing problem, equivalent to a specific two-dimensional conformal field theory. The monolayer-bilayer phase transition involves a 2D-to-3D crossover. Overall, this Review aims to provide a panoramic view of honeycomb layered frameworks with metallophilic bilayers and their potential applications in the emerging field of quantum matter. It is valuable for recent graduates and experts alike across diverse fields, extending beyond materials science and chemistry.

Interplay between altermagnetism and nonsymmorphic symmetries generating large anomalous Hall conductivity by semi-Dirac points induced anticrossings. (arXiv:2308.08416v2 [cond-mat.mtrl-sci] UPDATED)
Amar Fakhredine, Raghottam M. Sattigeri, Giuseppe Cuono, Carmine Autieri

We investigate the interplay between altermagnetic spin-splitting and nonsymmorphic symmetries using the space group no. 62 as a testbed. Studying different magnetic orders by means of first-principles calculations, we find that the altermagnetism (AM) is present in the C-type magnetic configuration while it is absent for the G-type and A-type configurations due to different magnetic space group types. The nonsymmorphic symmetries constrain the system to a four-fold degeneracy at the border of the Brillouin zone with semi-Dirac dispersion. In the case of large hybridization as for transition metal pnictides, the interplay between AM and nonsymmorphic symmetries generates an intricate network of several crossings and anticrossings that we describe in terms of semi-Dirac points and glide symmetries. When we add the spin-orbit coupling (SOC), we find a Neel-vector dependent spin-orbit splitting at the time-reversal invariant momenta points since the magnetic space groups depend on the Neel vector. The magnetic space group type-I produces antiferromagnetic hourglass electrons that disappear in the type-III. When the Neel vector is along x, we observe a glide-protected crossing that could generate a nodal-line in the altermagnetic phase. The SOC splits the remaining band crossings and band anticrossings producing a large anomalous Hall effect in all directions excluding the Neel-vector direction

Anomalous shift and optical vorticity in the steady photovoltaic current. (arXiv:2308.08596v2 [cond-mat.mes-hall] UPDATED)
A. Alexandradinata, Penghao Zhu

Steady illumination of a non-centrosymmetric semiconductor results in a bulk photovoltaic current, which is contributed by real-space displacements (`shifts') of charged quasiparticles as they transit between Bloch states. The shift induced by interband excitation via absorption of photons has received the prevailing attention. However, this excitation-induced shift can be far outweighed ($\ll$) by the shift induced by intraband relaxation, or by the shift induced by radiative recombination of electron-hole pairs. This outweighing ($\ll$) is attributed to (i) time-reversal-symmetric, intraband Berry curvature, which results in an anomalous shift of quasiparticles as they scatter with phonons, as well as to (ii) topological singularities in the interband Berry phase (`optical vortices'), which makes the photovoltaic current extraordinarily sensitive to the linear polarization vector of the light source. Both (i-ii) potentially lead to nonlinear conductivities of order $mAV^{-2}$, without finetuning of the incident radiation frequency, band gap, or joint density of states.

Stability of a quantum skyrmion: projective measurements and the quantum Zeno effect. (arXiv:2308.11014v2 [quant-ph] UPDATED)
Fabio Salvati, Mikhail I. Katsnelson, Andrey A. Bagrov, Tom Westerhout

Magnetic skyrmions are vortex-like quasiparticles characterized by long lifetime and remarkable topological properties. That makes them a promising candidate for the role of information carriers in magnetic information storage and processing devices. Although considerable progress has been made in studying skyrmions in classical systems, little is known about the quantum case: quantum skyrmions cannot be directly observed by probing the local magnetization of the system, and the notion of topological protection is elusive in the quantum realm. Here, we explore the potential robustness of quantum skyrmions in comparison to their classical counterparts. We theoretically analyze the dynamics of a quantum skyrmion subject to local projective measurements and demonstrate that the properties of the skyrmionic quantum state change very little upon external perturbations. We further show that by performing repetitive measurements on a quantum skyrmion, it can be completely stabilized through an analog of the quantum Zeno effect.

Magnetic Skyrmion: From Fundamental Physics to Pioneering Applications. (arXiv:2308.11811v2 [cond-mat.mes-hall] UPDATED)
Kishan K. Mishra, Aijaz H. Lone, Srikant Srinivasan, Hossein Fariborzi, Gianluca Setti

Skyrmionic devices exhibit energy-efficient and high-integration data storage and computing capabilities due to their small size, topological protection, and low drive current requirements. So, to realize these devices, an extensive study, from fundamental physics to practical applications, becomes essential. In this article, we present an exhaustive review of the advancements in understanding the fundamental physics behind magnetic skyrmions and the novel data storage and computing technologies based on them. We begin with an in-depth discussion of fundamental concepts such as topological protection, stability, statics and dynamics essential for understanding skyrmions, henceforth the foundation of skyrmion technologies. For the realization of CMOS-compatible skyrmion functional devices, the writing and reading of the skyrmions are crucial. We discuss the developments in different writing schemes such as STT, SOT, and VCMA. The reading of skyrmions is predominantly achieved via two mechanisms: the Magnetoresistive Tunnel Junction (MTJ) TMR effect and topological resistivity (THE). So, a thorough investigation into the Skyrmion Hall Effect, topological properties, and emergent fields is also provided, concluding the discussion on skyrmion reading developments. Based on the writing and reading schemes, we discuss the applications of the skyrmions in conventional logic, unconventional logic, memory applications, and neuromorphic computing in particular. Subsequently, we present an overview of the potential of skyrmion-hosting Majorana Zero Modes (MZMs) in the emerging Topological Quantum Computation and helicity-dependent skyrmion qubits.

Evolution of highly anisotropic magnetism in the titanium-based kagome metals LnTi$_3$Bi$_4$ (Ln: La...Gd$^{3+}$, Eu$^{2+}$, Yb$^{2+}$). (arXiv:2308.16138v2 [cond-mat.mtrl-sci] UPDATED)
Brenden R. Ortiz, Hu Miao, David S. Parker, Fazhi Yang, German D. Samolyuk, Eleanor M. Clements, Anil Rajapitamahuni, Turgut Yilmaz, Elio Vescovo, Jiaqiang Yan, Andrew F. May, Michael A. McGuire

Here we present the family of titanium-based kagome metals of the form LnTi$_3$Bi$_4$ (Ln: La...Gd$^{3+}$, Eu$^{2+}$, Yb$^{2+}$). Single crystal growth methods are presented alongside detailed magnetic and thermodynamic measurements. The orthorhombic (Fmmm) LnTi$_3$Bi$_4$ family of compounds exhibit slightly distorted titanium-based kagome nets interwoven with zig-zag lanthanide-based (Ln) chains. Crystals are easily exfoliated parallel to the kagome sheets and angular resolved photoemission (ARPES) measurements highlight the intricacy of the electronic structure in these compounds, with Dirac points existing at the Fermi level. The magnetic properties and the associated anisotropy emerge from the quasi-1D zig-zag chains of Ln, and impart a wide array of magnetic ground states ranging from anisotropic ferromagnetism to complex antiferromagnetism with a cascade of metamagnetic transitions. Kagome metals continue to provide a rich direction for the exploration of magnetic, topologic, and highly correlated behavior. Our work here introduces the LnTi$_3$Bi$_4$ compounds to augment the continuously expanding suite of complex and interesting kagome materials.

Found 7 papers in prb
Date of feed: Fri, 08 Sep 2023 03:17:10 GMT

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

Symmetry-protected topological phases, conformal criticalities, and duality in exactly solvable SO($n$) spin chains
Sreejith Chulliparambil, Hua-Chen Zhang, and Hong-Hao Tu
Author(s): Sreejith Chulliparambil, Hua-Chen Zhang, and Hong-Hao Tu

We introduce a family of $\mathrm{SO}(n$)-symmetric spin chains which generalize the transverse-field Ising chain for $n=1$. These spin chains are defined with gamma matrices and can be exactly solved by mapping to $n$ species of itinerant Majorana fermions coupled to a static ${\mathbb{Z}}_{2}$ gau…

[Phys. Rev. B 108, 094411] Published Thu Sep 07, 2023

Topological Hall-like magnetoresistance humps in anomalous Hall loops caused by planar Hall effect
Chunjie Yan, Zui Tao, Zhenyu Gao, Zishuang Li, Xiao Xiao, Haozhe Wang, Lina Chen, and Ronghua Liu
Author(s): Chunjie Yan, Zui Tao, Zhenyu Gao, Zishuang Li, Xiao Xiao, Haozhe Wang, Lina Chen, and Ronghua Liu

Achievement of various topological spin textures, such as magnetic skyrmion and chiral domain walls, in heavy-metal/ferromagnet (FM) multilayer films with interfacial Dzyaloshinskii-Moriya interaction have attracted enormous attention owing to their topological nature, emergent electromagnetic prope…

[Phys. Rev. B 108, 094414] Published Thu Sep 07, 2023

Higher-order nodal hinge states in doped superconducting topological insulator
Sayed Ali Akbar Ghorashi, Jennifer Cano, Enrico Rossi, and Taylor L. Hughes
Author(s): Sayed Ali Akbar Ghorashi, Jennifer Cano, Enrico Rossi, and Taylor L. Hughes

Doped strong topological insulators are one of the most promising candidates to realize a fully gapped three-dimensional topological superconductor (TSC). In this Letter, we revisit this system and reveal a possibility for higher-order topology which was previously missed. We find that over a finite…

[Phys. Rev. B 108, 094504] Published Thu Sep 07, 2023

Casimir-Lifshitz force between graphene-based structures out of thermal equilibrium
Youssef Jeyar, Kevin Austry, Minggang Luo, Brahim Guizal, H. B. Chan, and Mauro Antezza
Author(s): Youssef Jeyar, Kevin Austry, Minggang Luo, Brahim Guizal, H. B. Chan, and Mauro Antezza

We study the nonequilibrium Casimir-Lifshitz force between graphene-based parallel structures held at different temperatures and in the presence of an external thermal bath at a third temperature. The graphene conductivity, which is itself a function of temperature, as well as of chemical potential,…

[Phys. Rev. B 108, 115412] Published Thu Sep 07, 2023

Certifying entanglement of spins on surfaces using ESR-STM
Y. del Castillo and J. Fernández-Rossier
Author(s): Y. del Castillo and J. Fernández-Rossier

We propose a protocol to certify the presence of entanglement in artificial on-surface atomic and molecular spin arrays using electron spin resonance carried by scanning tunnel microscopy (ESR-STM). We first generalize the theorem that relates global spin susceptibility as an entanglement witness to…

[Phys. Rev. B 108, 115413] Published Thu Sep 07, 2023

Topological Nernst and topological thermal Hall effect in rare-earth kagome ${\mathrm{ScMn}}_{6}{\mathrm{Sn}}_{6}$
Richa P. Madhogaria, Shirin Mozaffari, Heda Zhang, William R. Meier, Seung-Hwan Do, Rui Xue, Takahiro Matsuoka, and David G. Mandrus
Author(s): Richa P. Madhogaria, Shirin Mozaffari, Heda Zhang, William R. Meier, Seung-Hwan Do, Rui Xue, Takahiro Matsuoka, and David G. Mandrus

Thermal and thermoelectric measurements are known as powerful tools to uncover the physical properties of quantum materials due to their sensitivity towards the scattering and chirality of heat carriers. We use these techniques to confirm the presence of momentum and real-space topology in ${\mathrm…

[Phys. Rev. B 108, 125114] Published Thu Sep 07, 2023

Piezoresistive effect in two-dimensional Dirac materials
D. S. Eliseev, M. V. Boev, V. M. Kovalev, and I. G. Savenko
Author(s): D. S. Eliseev, M. V. Boev, V. M. Kovalev, and I. G. Savenko

Applying the Bir-Picus ansatz for strain-induced corrections to the electron momentum scattering time on impurities in a transition metal dichalcogenide monolayer, and taking the parameters of $\mathrm{Mo}{\mathrm{S}}_{2}$ for our estimations, we derive general analytical expressions describing the …

[Phys. Rev. B 108, L121403] Published Thu Sep 07, 2023

Found 4 papers in prl
Date of feed: Fri, 08 Sep 2023 03:17:08 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)

Non-Hermitian Waveguide Cavity QED with Tunable Atomic Mirrors
Wei Nie, Tao Shi, Yu-xi Liu, and Franco Nori
Author(s): Wei Nie, Tao Shi, Yu-xi Liu, and Franco Nori

Optical mirrors determine cavity properties by means of light reflection. Imperfect reflection gives rise to open cavities with photon loss. We study an open cavity made of atom-dimer mirrors with a tunable reflection spectrum. We find that the atomic cavity shows anti-$\mathcal{PT}$ symmetry. The a…

[Phys. Rev. Lett. 131, 103602] Published Thu Sep 07, 2023

Effects of Laser Bandwidth in Direct-Drive High-Performance DT-Layered Implosions on the OMEGA Laser
D. Patel, J. P. Knauer, D. Cao, R. Betti, R. Nora, A. Shvydky, V. Gopalaswamy, A. Lees, S. Sampat, W. R. Donaldson, S. P. Regan, C. Stoeckl, C. J. Forrest, V. Yu. Glebov, D. R. Harding, M. J. Bonino, R. T. Janezic, D. Wasilewski, C. Fella, C. Shuldberg, J. Murray, D. Guzman, and B. Serrato
Author(s): D. Patel, J. P. Knauer, D. Cao, R. Betti, R. Nora, A. Shvydky, V. Gopalaswamy, A. Lees, S. Sampat, W. R. Donaldson, S. P. Regan, C. Stoeckl, C. J. Forrest, V. Yu. Glebov, D. R. Harding, M. J. Bonino, R. T. Janezic, D. Wasilewski, C. Fella, C. Shuldberg, J. Murray, D. Guzman, and B. Serrato

In direct-drive inertial confinement fusion, the laser bandwidth reduces the laser imprinting seed of hydrodynamic instabilities. The impact of varying bandwidth on the performance of direct-drive DT-layered implosions was studied in targets with different hydrodynamic stability properties. The stab…

[Phys. Rev. Lett. 131, 105101] Published Thu Sep 07, 2023

Failure of Topological Invariants in Strongly Correlated Matter
Jinchao Zhao, Peizhi Mai, Barry Bradlyn, and Philip Phillips
Author(s): Jinchao Zhao, Peizhi Mai, Barry Bradlyn, and Philip Phillips

When zeros appear in the Green function, as in strongly correlated systems, the invariant N3 for the two-dimensional quantum anomalous Hall insulator not necessarily encodes a topological invariant of the ground state, in contrast to expectations.

[Phys. Rev. Lett. 131, 106601] Published Thu Sep 07, 2023

Nonreciprocal Cahn-Hilliard Model Emerges as a Universal Amplitude Equation
Tobias Frohoff-Hülsmann and Uwe Thiele
Author(s): Tobias Frohoff-Hülsmann and Uwe Thiele

Oscillatory behavior is ubiquitous in out-of-equilibrium systems showing spatiotemporal pattern formation. Starting from a linear large-scale oscillatory instability—a conserved-Hopf instability—that naturally occurs in many active systems with two conservation laws, we derive a corresponding amplit…

[Phys. Rev. Lett. 131, 107201] Published Thu Sep 07, 2023

Found 1 papers in prx
Date of feed: Fri, 08 Sep 2023 03:17:08 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)

Coherent-Incoherent Crossover of Charge and Neutral Mode Transport as Evidence for the Disorder-Dominated Fractional Edge Phase
Masayuki Hashisaka, Takuya Ito, Takafumi Akiho, Satoshi Sasaki, Norio Kumada, Naokazu Shibata, and Koji Muraki
Author(s): Masayuki Hashisaka, Takuya Ito, Takafumi Akiho, Satoshi Sasaki, Norio Kumada, Naokazu Shibata, and Koji Muraki

A new topological device architecture provides clear evidence of disorder-dominated couplings among counterpropagating edge channels, a key insight for quantum technologies that rely on edge channel manipulation.

[Phys. Rev. X 13, 031024] Published Thu Sep 07, 2023

Found 2 papers in pr_res
Date of feed: Fri, 08 Sep 2023 03:17:10 GMT

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

Error-tolerant oblivious transfer in the noisy-storage model
Cosmo Lupo, James T. Peat, Erika Andersson, and Pieter Kok
Author(s): Cosmo Lupo, James T. Peat, Erika Andersson, and Pieter Kok

The noisy-storage model of quantum cryptography allows for information-theoretically secure two-party computation based on the assumption that a cheating user has at most access to an imperfect, noisy quantum memory, whereas the honest users do not need a quantum memory at all. In general, the more …

[Phys. Rev. Research 5, 033163] Published Thu Sep 07, 2023

Quantum computing on magnetic racetracks with flying domain wall qubits
Ji Zou, Stefano Bosco, Banabir Pal, Stuart S. P. Parkin, Jelena Klinovaja, and Daniel Loss
Author(s): Ji Zou, Stefano Bosco, Banabir Pal, Stuart S. P. Parkin, Jelena Klinovaja, and Daniel Loss

Domain walls (DWs) on magnetic racetracks are at the core of the field of spintronics, providing a basic element for classical information processing. Here, we show that mobile DWs also provide a blueprint for large-scale quantum computers. Remarkably, these DW qubits showcase exceptional versatilit…

[Phys. Rev. Research 5, 033166] Published Thu Sep 07, 2023

Found 2 papers in nano-lett
Date of feed: Thu, 07 Sep 2023 13:16:18 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] Determining the Number of Graphene Nanoribbons in Dual-Gate Field-Effect Transistors
Jian Zhang, Gabriela Borin Barin, Roman Furrer, Cheng-Zhuo Du, Xiao-Ye Wang, Klaus Müllen, Pascal Ruffieux, Roman Fasel, Michel Calame, and Mickael L. Perrin

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01931

[ASAP] Ultrafast Electronic Dynamics in Anisotropic Indirect Interlayer Excitonic States of Monolayer WSe2/ReS2 Heterojunctions
Yulu Qin, Rui Wang, Xiaoyuan Wu, Yunkun Wang, Xiaofang Li, Yunan Gao, Liangyou Peng, Qihuang Gong, and Yunquan Liu

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02488

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)

Sustainable mining of natural vein graphite via acid-extraction from waste attached to rock pieces of vein banks
Gamaralalage R. A. Kumara

Scientific Reports, Published online: 07 September 2023; doi:10.1038/s41598-023-42074-5

Sustainable mining of natural vein graphite via acid-extraction from waste attached to rock pieces of vein banks