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| Open AccessThe observation of π-shifts in the Little-Parks effect in 4Hb-TaS2
The authors report the measurement of the Little-Parks effect in the unconventional superconductor candidate 4Hb-TaS2. They find a π-shift in the transition-temperature oscillations and an ehancement of Tc as a function of the out-of-plane field when a constant in-plane field is applied, consistent with a multi-component order parameter.
- Avior Almoalem
- , Irena Feldman
- & Amit Kanigel
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Article
| Open AccessThe quantum geometric origin of capacitance in insulators
The authors reveal a link between the quantum metric and the dielectric constant of insulators, determining the geometric capacitance of insulators and revealing the intrinsic delocalization of electrons in the lattice.
- Ilia Komissarov
- , Tobias Holder
- & Raquel Queiroz
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| Open AccessHigh-power electrically pumped terahertz topological laser based on a surface metallic Dirac-vortex cavity
The researchers showcase an exciting surface metallic Dirac-vortex cavity design with enhanced power capabilities for electrically pumped Topological Lasers in the THz spectral range.
- Junhong Liu
- , Yunfei Xu
- & Shenqiang Zhai
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| Open AccessSelf acceleration from spectral geometry in dissipative quantum-walk dynamics
The strong connection between the dynamics of a physical system and its Hamiltonian’s spectrum has scarcely been applied in the non-Hermitian case. Here, the authors use a photonic quantum walk to confirm and expand previous theoretical analyses connecting self-acceleration dynamics with non-trivial point-gap topology.
- Peng Xue
- , Quan Lin
- & Wei Yi
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Article
| Open AccessRashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5
Topological flat bands offer a solid-state platform for studying the interplay between topology and electron correlations. Here, the authors demonstrate that a prototypical 3D Dirac material can host topological flat bands under magnetic fields due to polar-distortion-assisted Rashba splitting.
- Dong Xing
- , Bingbing Tong
- & Cheng-Long Zhang
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Article
| Open AccessNon-coplanar helimagnetism in the layered van-der-Waals metal DyTe3
Helimagnetic materials host a twisted magnetic texture, realizing screws, cycloids, and cones. While helimagnets are common in three dimensional materials, layered van der Waals helimagnets are exceedingly rare. Here, Akatsuka et al. demonstrate conical ordering in the easily cleavable magnet DyTe3.
- Shun Akatsuka
- , Sebastian Esser
- & Max Hirschberger
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Article
| Open AccessHigh spin axion insulator
Existing proposals of axion insulators are limited to spin-1/2 systems. Here the authors put forward a concept of a high spin axion insulator with several peculiar properties, such as the absence of gapless surface states and tunability of the axion field by an external magnetic field.
- Shuai Li
- , Ming Gong
- & X. C. Xie
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Article
| Open AccessPolar Bloch points in strained ferroelectric films
Authors predict polar Bloch points with negative capacitance in tensile-strained ultrathin ferroelectric PbTiO3 film by phase-field simulations, observing their polarization structures by scanning transmission electron microscopic imaging.
- Yu-Jia Wang
- , Yan-Peng Feng
- & Xiu-Liang Ma
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Article
| Open AccessSpin-orbit-splitting-driven nonlinear Hall effect in NbIrTe4
Previous work proposed the Berry curvature dipole as the mechanism of the nonlinear Hall effect. Lee et al. establish the sign-changing Berry curvature hot spots from spin-orbit split bands as the origin of the Berry curvature dipole and link it to the nonlinear Hall effect in the topological semimetal NbIrTe4.
- Ji-Eun Lee
- , Aifeng Wang
- & Hyejin Ryu
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Article
| Open AccessTopologically trivial gap-filling in superconducting Fe(Se,Te) by one-dimensional defects
Previous measurements of FeSe0.45Te0.55 found one-dimensional (1D) defects that were interpretated as domain walls hosting propagating Majorana topological modes. Here, the authors reveal that these 1D defects correspond to sub-surface debris and show that the filling of the superconducting gap on these defects is topologically trivial.
- A. Mesaros
- , G. D. Gu
- & F. Massee
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Article
| Open AccessRevealing the spatial nature of sublattice symmetry
Sublattice symmetry has long been synonymous with chiral symmetry when it comes to topological classification. Here, the authors challenge this notion by systematically investigating sublattice symmetry and revealing its spatial nature with a precise description in terms of symmetry algebra and representation.
- Rong Xiao
- & Y. X. Zhao
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Article
| Open AccessWeyl spin-momentum locking in a chiral topological semimetal
Spin-momentum locking is a fundamental property of condensed matter systems. Here, the authors evidence parallel Weyl spin-momentum locking of multifold fermions in the chiral topological semimetal PtGa.
- Jonas A. Krieger
- , Samuel Stolz
- & Niels B. M. Schröter
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Article
| Open AccessHigh-entropy engineering of the crystal and electronic structures in a Dirac material
Manipulating the electronic properties of topological semimetals is a central goal of modern condensed matter physics research. Here, the authors demonstrate how a high-entropy engineering approach allows for the tuning of the crystal structure and the electronic states in a Dirac semimetal.
- Antu Laha
- , Suguru Yoshida
- & Zhiqiang Mao
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Article
| Open AccessFabrication-induced even-odd discrepancy of magnetotransport in few-layer MnBi2Te4
MnBi2Te4 is an antiferromagnetic topological insulator. This combination of magnetic ordering and topological properties has resulted in intense interest, however, like many van der Waals materials, experimental results are hampered by fabrication difficulties. Here, Li, Wang, Lian et al. show that the fabrication process itself can result in mismatched thickness dependence of magneto-transport measurements. ‘
- Yaoxin Li
- , Yongchao Wang
- & Chang Liu
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Article
| Open AccessOrphan high field superconductivity in non-superconducting uranium ditelluride
In addition to its low-field superconducting state, UTe2 features a re-entrant superconducting state when high magnetic fields are applied at a particular range of angles. Here, the authors demonstrate that the high-field re-entrant superconducting state survives even when the low-field superconducting state is destroyed by disorder.
- Corey E. Frank
- , Sylvia K. Lewin
- & Nicholas P. Butch
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Article
| Open AccessViolation of emergent rotational symmetry in the hexagonal Kagome superconductor CsV
3 Sb5 Superconductors with hexagonal symmetry are expected to be isotropic particularly near the critical temperature Tc, a property called emergent rotational symmetry (ERS). Here, the authors use calorimetry to study the hexagonal kagome superconductor CsV3Sb5 and find a violation of the expected ERS, hinting at realization of exotic superconductivity.
- Kazumi Fukushima
- , Keito Obata
- & Shingo Yonezawa
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Article
| Open AccessAnderson critical metal phase in trivial states protected by average magnetic crystalline symmetry
The authors identify a novel delocalization mechanism for topologically trivial obstructed insulators. In transitioning from two topologically trivial states, where one would expect Anderson’s localization to take place, a delocalized ‘critical metal phase’ appears.
- Fa-Jie Wang
- , Zhen-Yu Xiao
- & Zhi-Da Song
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Article
| Open AccessNonlinear optical diode effect in a magnetic Weyl semimetal
Here the authors demonstrate a broadband nonlinear optical diode effect and its electric control in the magnetic Weyl semimetal CeAlSi. Their findings advance ongoing research to identify novel optical phenomena in topological materials.
- Christian Tzschaschel
- , Jian-Xiang Qiu
- & Su-Yang Xu
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Article
| Open AccessHidden non-collinear spin-order induced topological surface states
Several recent experimental studies have found disconnected Fermi surface arcs emerging below the Neel temperature in several rare-earth mono-pnictides. While these electronic states have been attributed to a non-collinear antiferromagnetic order, experimental evidence of this has been lacking. Here Huang et al demonstrate the emergence of non-collinear antiferromagnetic order using spin-polarized scanning tunnelling microscopy.
- Zengle Huang
- , Hemian Yi
- & Weida Wu
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| Open AccessObservation of Kekulé vortices around hydrogen adatoms in graphene
Kekulé vortices in hexagonal lattices can host fractionalized charges at zero magnetic field, but have remained out of experimental reach. Here, the authors report a Kekulé vortex in the local density states of graphene around a chemisorbed hydrogen adatom.
- Yifei Guan
- , Clement Dutreix
- & Vincent T. Renard
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| Open AccessMagnetic field filtering of the boundary supercurrent in unconventional metal NiTe2-based Josephson junctions
The authors study Josephson junctions where the weak link is a NiTe2 flake. They find that in-plane magnetic field in a particular direction causes the supercurrent to concentrate in the edges of the flake, excluding the bulk. They further argue that the supercurrent is carried by higher-order hinge states.
- Tian Le
- , Ruihan Zhang
- & Fanming Qu
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| Open AccessReversible non-volatile electronic switching in a near-room-temperature van der Waals ferromagnet
The controlled manipulation of the topological phases of electronic materials is a central goal of modern condensed matter research. Here, the authors demonstrate controllable switching between two distinct topological phases in a layered ferromagnet via thermal cycling.
- Han Wu
- , Lei Chen
- & Ming Yi
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Article
| Open AccessTopological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures
Moiré patterns have been experimentally observed in heterostructures comprised of topological insulator films. Here, the authors propose that topological insulator-based moiré heterostructures could be a host of isolated topologically non-trivial moiré minibands for the study of the interplay between topology and correlation.
- Kaijie Yang
- , Zian Xu
- & Chao-Xing Liu
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Article
| Open AccessTwisted photonic Weyl meta-crystals and aperiodic Fermi arc scattering
Fermi arcs show unpredictable diffraction features resulting from their long-range scattering order in aperiodic systems. Here, authors continuously twist a bi-block Weyl meta-crystal and experimentally observe the twisted Fermi arc reconstruction.
- Hanyu Wang
- , Wei Xu
- & Biao Yang
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Article
| Open AccessDislocation Majorana bound states in iron-based superconductors
The authors propose that screw or edge dislocations can trap Majorana zero modes in the absence of an external magnetic field. They predict that the Majoranas will appear as second-order topological modes on the four corners of an embedded 2D subsystem defined by the cutting plane of the dislocation.
- Lun-Hui Hu
- & Rui-Xing Zhang
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Article
| Open AccessAtomically precise engineering of spin–orbit polarons in a kagome magnetic Weyl semimetal
Defect engineering in topological materials is a frontier that promises tunable physical properties with rich applications. Here, the authors demonstrate the atomically precise engineering of vacancies in a topological semimetal, which locally tunes the magnetic properties.
- Hui Chen
- , Yuqing Xing
- & Hong-Jun Gao
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Article
| Open AccessRevealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal
The authors study the field-induced ferromagnetic state of MnBi2-xSbxTe4 by quantum oscillations and high-field Hall effect measurements. They confirm a single pair of type-II Weyl nodes, the long-sought “ideal” Weyl semimetal.
- Qianni Jiang
- , Johanna C. Palmstrom
- & Jiun-Haw Chu
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Article
| Open AccessAnomalous and Chern topological waves in hyperbolic networks
Here the authors experimentally demonstrate the anomalous and Chern topological phases in a hyperbolic non-reciprocal scattering network, establishing unidirectional channels to induce new and exciting wave transport properties in curved spaces.
- Qiaolu Chen
- , Zhe Zhang
- & Romain Fleury
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Article
| Open AccessThe discovery of three-dimensional Van Hove singularity
Van Hove singularities (VHS) are believed to exist in one and two dimensions, but rarely found in three dimensions (3D). Here the authors report the discovery of 3D VHS in a topological magnet EuCd2As2 by magneto-infrared spectroscopy.
- Wenbin Wu
- , Zeping Shi
- & Xiang Yuan
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Article
| Open AccessObservation of vortex-string chiral modes in metamaterials
Vortex string, hypothetical topological defects in cosmology, are predicted to support massless chiral modes. The authors successfully mimicked vortex-string physics in a metamaterial system and experimentally observed the chiral modes within it.
- Jingwen Ma
- , Ding Jia
- & Xiang Zhang
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Article
| Open AccessThree-dimensional flat Landau levels in an inhomogeneous acoustic crystal
Artificial magnetic fields have been meticulously engineered in a 3D acoustic crystal, facilitating the creation of 3D flat bands through Landau quantization of quasiparticles arising from nodal-ring band degeneracies.
- Zheyu Cheng
- , Yi-Jun Guan
- & Baile Zhang
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Perspective
| Open AccessQuantum many-body simulations on digital quantum computers: State-of-the-art and future challenges
Digital quantum simulations of quantum many-body systems have emerged as one of the most promising applications of near-term quantum computing. This Perspective article provides an overview and an outlook on future developments in this field.
- Benedikt Fauseweh
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Article
| Open AccessQuantifying the photocurrent fluctuation in quantum materials by shot noise
The bulk photovoltaic effect and DC photocurrent generation can be used to detect topology and geometry in non-centrosymmetric quantum materials. Here, the authors theoretically propose the detection of DC shot noise as a diagnostic tool for the characterization of the band quantum geometry under relaxed symmetry conditions.
- Longjun Xiang
- , Hao Jin
- & Jian Wang
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Article
| Open AccessLight-induced switching between singlet and triplet superconducting states
S. Gassner et al. propose using light pulses to drive a centrosymmetric s-wave superconductor with strong spin-orbit coupling into a metastable triplet p-wave superconductor with non-trivial topology. The two superconducting orders must be closely competing in equilibrium and the light pulse must break a generalized, dynamic form of inversion symmetry.
- Steven Gassner
- , Clara S. Weber
- & Martin Claassen
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Article
| Open AccessHomochiral antiferromagnetic merons, antimerons and bimerons realized in synthetic antiferromagnets
Topological antiferromagnetic spin textures, including merons, antimerons, and bimerons, are demonstrated in synthetic antiferromagnets by three-dimensional vector imaging of the Néel order parameter and investigated by micromagnetic analysis.
- Mona Bhukta
- , Takaaki Dohi
- & Mathias Kläui
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Article
| Open AccessHyperbolic photonic topological insulators
Here the authors develop a coupled ring resonators platform for realizing topological states of matter with hyperbolic dispersion thus offering an approach to boost the efficiency of topological photonic devices.
- Lei Huang
- , Lu He
- & Xiangdong Zhang
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Article
| Open AccessMeasuring entanglement entropy and its topological signature for phononic systems
Entanglement entropy exhibits rich phenomenology connected to different kinds of phases in condensed matter. Here, the authors confirm some of these predictions by experimentally probing nonlocal correlations in 1D and 2D phononic crystal based on interconnected resonating acoustic cavities.
- Zhi-Kang Lin
- , Yao Zhou
- & Jian-Hua Jiang
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| Open AccessChiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers
S. X. M. Riberolles et al. study the kagome Chern insulator TbMn6Sn6 via inelastic neutron scattering. They observe signatures of chiral and flat-band magnons, which are highly localized in real space and strongly damped in the time domain.
- S. X. M. Riberolles
- , Tyler J. Slade
- & R. J. McQueeney
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Article
| Open AccessEvidence for Topological Protection Derived from Six-Flux Composite Fermions
Huang et al. study fractional quantum Hall (fQH) states in high-quality GaAs/AlGaAs samples. They report evidence for a fQH state at filling factor ν = 9/11, which they associate with the formation of six-flux composite fermions.
- Haoyun Huang
- , Waseem Hussain
- & G. A. Csáthy
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Article
| Open AccessRobust temporal adiabatic passage with perfect frequency conversion between detuned acoustic cavities
Phase matching is pivotal for realizing complete energy transfer for classical waves. Here, authors propose temporal quasi-phase matching method and realize robust and complete energy transfer between arbitrarily detuned acoustic cavities by combing the concept of stimulated Raman adiabatic passage.
- Zhao-Xian Chen
- , Yu-Gui Peng
- & Yan-Qing Lu
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Article
| Open AccessTunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi
Topological semimetals with space-inversion and time-reversal symmetry breaking have attracted attention recently. Here, using a combination of experimental techniques and calculations, the authors demonstrate the tunability of the Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi.
- Erjian Cheng
- , Limin Yan
- & Bernd Büchner
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Article
| Open AccessNonlinear topological symmetry protection in a dissipative system
Applications of spontaneous symmetry breaking are hindered by unavoidable imperfections. Here, the authors reveal how a phase defect provides topological robustness to this process, enabling a bias free realization without fine tuning of parameters.
- Stéphane Coen
- , Bruno Garbin
- & Julien Fatome
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Article
| Open AccessResolving the topology of encircling multiple exceptional points
When multiple oscillators are tuned, degeneracies occur on a knot-shaped region in the space of tuning parameters. This knot influences how such systems can be tuned. Here, the authors reconcile two common means for visualizing this influence.
- Chitres Guria
- , Qi Zhong
- & Jack Gwynne Emmet Harris
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Article
| Open AccessObservation of giant room-temperature anisotropic magnetoresistance in the topological insulator β-Ag2Te
Achieving room-temperature high anisotropic magnetoresistance ratios is highly desirable for magnetic sensors. Here, the authors observe a high anisotropic magnetoresistance ratio of −39% and a giant planar Hall effect (520 μΩ·cm) at room temperature under 9 T in β-Ag2Te crystals grown by CVD.
- Wei Ai
- , Fuyang Chen
- & Jinxiong Wu
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Article
| Open AccessInteracting topological quantum chemistry in 2D with many-body real space invariants
While the classification of single-particle topological phases has been established, recent efforts have been made to extend it to interacting limit. Here the authors present a classification of interacting topological systems in 2D based on the generalization of real space invariants.
- Jonah Herzog-Arbeitman
- , B. Andrei Bernevig
- & Zhi-Da Song
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Article
| Open AccessNon-Abelian Floquet braiding and anomalous Dirac string phase in periodically driven systems
R.-J. Slager et al. extend the theory of multigap topology from static to non-equilibrium systems. They identify Floquet-induced non-Abelian braiding, resulting in a phase characterized by anomalous Euler class, a multi-gap topological invariant. They also find a gapped anomalous Dirac string phase. Both phases have no static counterparts and exhibit distinct boundary signatures.
- Robert-Jan Slager
- , Adrien Bouhon
- & F. Nur Ünal
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Article
| Open AccessSupercurrent mediated by helical edge modes in bilayer graphene
P. Rout et al. study Josephson junctions where the weak link is WSe2-encapsulated bilayer graphene, which features helical edge modes. They argue that the supercurrent channels along opposite edges of the weak link are coupled by a circulating helical mode.
- Prasanna Rout
- , Nikos Papadopoulos
- & Srijit Goswami
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Article
| Open AccessChirality manipulation of ultrafast phase switches in a correlated CDW-Weyl semimetal
The charge-density-wave Weyl semimetal (TaSe4)2I is a candidate for an axion insulator, however it may be obscured by polaron physics. Here, using ultrafast terahertz photocurrent spectroscopy, the authors realize phase switches from the polaronic state, to the charge density wave phase, and to the Weyl phase.
- Bing Cheng
- , Di Cheng
- & Jigang Wang
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Article
| Open AccessMagnon thermal Hall effect via emergent SU(3) flux on the antiferromagnetic skyrmion lattice
Strongly correlated and topological phases of matter can be often described using the tools of quantum field theory. Here the authors report the thermal Hall effect in the antiferromagnetic skyrmion lattice of MnSc2S4, revealing transport features that can be attributed to an emergent SU(3) gauge field.
- Hikaru Takeda
- , Masataka Kawano
- & Chisa Hotta