Featured
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Article
| Open Access
Spatially reconfigurable antiferromagnetic states in topologically rich free-standing nanomembranes
Topological antiferromagnetic states are generated and spatially reconfigured in free-standing crystalline membranes of haematite through strain design.
- Hariom Jani
- , Jack Harrison
- & Paolo G. Radaelli
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Article
| Open Access
Parity–time-symmetric photonic topological insulator
The authors propose a non-Hermitian topological insulator with a real-valued energy spectrum based on a periodically driven Floquet model implemented in a photonic platform where generalized parity–time symmetry is protected against spontaneous symmetry breaking under a spatiotemporal gain and loss distribution.
- Alexander Fritzsche
- , Tobias Biesenthal
- & Alexander Szameit
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News & Views |
Imaging the twist of antiferromagnetic merons in a blood-red iron oxide
The antiferromagnetic material haematite, named for its blood-red colour, hosts swirling spin vortices termed merons. The rotation sense of such antiferromagnetic vortices has now been imaged in real space.
- Leonie Spitz
- & Max Hirschberger
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News & Views |
All-electric writing of a chiral quantum memory
An all-electric switch of the persistent electron swirl in a quantum anomalous Hall state enables researchers to flip the electronic chirality of this quantum state.
- Philip J. W. Moll
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Article
| Open Access
Revealing emergent magnetic charge in an antiferromagnet with diamond quantum magnetometry
Diamond quantum magnetometry is utilized to directly read the vorticity of antiferromagnetic spin textures through coupled multi-polar emergent magnetic charge distributions.
- Anthony K. C. Tan
- , Hariom Jani
- & Mete Atatüre
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News & Views |
Bowing to ferroelectric artificial flux closure
By inserting an epitaxial in-plane buffer layer of Bi5FeTi3O15, an artificial flux closure architecture enables ferroelectric polarization from a single unit cell of BaTiO3 or BiFeO3.
- Neus Domingo
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Article |
Electrical switching of the edge current chirality in quantum anomalous Hall insulators
Thermally assisted spin–orbit torque is used to switch the edge current chirality in mesoscopic quantum anomalous Hall devices.
- Wei Yuan
- , Ling-Jie Zhou
- & Cui-Zu Chang
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Article
| Open Access
Defeating depolarizing fields with artificial flux closure in ultrathin ferroelectrics
Ferroelectric dead layers can form at perovskite interfaces—a major challenge in integrating oxide thin films into devices. Here, by depositing an in-plane-polarized epitaxial buffer layer of Bi5FeTi3O15, out-of-plane polarization is demonstrated in ultrathin films down to the single-unit-cell level.
- Elzbieta Gradauskaite
- , Quintin N. Meier
- & Morgan Trassin
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Article
| Open Access
Light-induced hexatic state in a layered quantum material
The authors report the emergence of a transient hexatic state during laser-induced transformation between two charge-density wave (CDW) phases in a thin film of the CDW material 1T-TaS2.
- Till Domröse
- , Thomas Danz
- & Claus Ropers
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News & Views |
Flipping antiferromagnetism by light
Antiferromagnetism has a vanishing total magnetization and thus is extremely challenging to manipulate. Now, circularly polarized light is shown to efficiently detect, induce and switch a unique class of antiferromagnets.
- Youngjun Ahn
- & Liuyan Zhao
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News & Views |
Atomic heteroepitaxy for topological superconductivity
Epitaxial topological heterostructures of (Bi,Sb)2Te3/graphene/gallium have been achieved using molecular-beam epitaxy, providing the opportunity to access Majorana zero modes in electrical transport when combined with van der Waals tunnel junctions.
- Faxian Xiu
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News & Views |
A new way to Weyl
Scientists have realized Weyl modes by exposing a topological insulator to large magnetic fields. Their effort enriches the toolbox to design, engineer and manipulate topological materials for physics research and materials applications.
- Zhengguang Lu
- & Long Ju
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Article |
Axion optical induction of antiferromagnetic order
The authors demonstrate control of antiferromagnetic order using helical light.
- Jian-Xiang Qiu
- , Christian Tzschaschel
- & Su-Yang Xu
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Letter |
Proximity-induced superconductivity in epitaxial topological insulator/graphene/gallium heterostructures
This work reports on the synthesis and proximity-induced superconductivity in a topological insulator-based, thin-film heterostructure towards the development of a scalable material platform that could potentially support robust quantum computing.
- Cequn Li
- , Yi-Fan Zhao
- & Jun Zhu
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Article |
Observation of spin-momentum locked surface states in amorphous Bi2Se3
The authors present evidence suggesting that amorphous Bi2Se3 displays topological properties, signalling a new regime for the pursuit of topological matter.
- Paul Corbae
- , Samuel Ciocys
- & Frances Hellman
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News & Views |
Thermal Hall conductivity of α-RuCl3
Thermal Hall conductivity originating from topological magnons is observed in the Kitaev candidate α-RuCl3 in broad intervals of temperature and in-plane magnetic field, raising questions on the role of the Majorana mode in heat conduction.
- Hae-Young Kee
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News & Views |
Structural tweaking of 2D quantum magnetism
A combination of tunnelling spectroscopy, magnetotransport, electron diffraction and ab initio calculations have revealed that picometre-scale lattice distortions reverse magnetic anisotropy and enhance magnetic frustration in atomically thin ruthenium trichloride — a key step towards realizing a quantum spin liquid in the two-dimensional limit.
- Hu Miao
- & Gábor B. Halász
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Article |
Topological steering of light by nematic vortices and analogy to cosmic strings
Liquid crystal (LC) applications typically rely on defining the non-topological spatial patterns of the optical axis. Here, the authors demonstrate the topological steering of light by LC nematic vortices, futher establishing an analogy between topological light steering by LC vortices and cosmic strings.
- Cuiling Meng
- , Jin-Sheng Wu
- & Ivan I. Smalyukh
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Letter |
Planar thermal Hall effect of topological bosons in the Kitaev magnet α-RuCl3
The authors report a strongly temperature-dependent thermal conductivity at low temperature, consistent with topological bosonic modes in a Chern-insulator-like model.
- Peter Czajka
- , Tong Gao
- & N. P. Ong
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Article |
Charge order landscape and competition with superconductivity in kagome metals
The authors use high-resolution angle-resolved photoemission spectroscopy to determine the microscopic structure of three-dimensional charge order in AV3Sb5 (A = K, Rb, Cs) and its interplay with superconductivity.
- Mingu Kang
- , Shiang Fang
- & Riccardo Comin
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Article |
Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi2Se3/monolayer NbSe2 heterostructures
Using molecular-beam epitaxy, we synthesize heterostructures of topological insulator Bi2Se3 and the Ising superconductor monolayer NbSe2. By changing the Bi2Se3 thickness, they demonstrate a crossover from Ising- to Rashba-type superconducting pairing.
- Hemian Yi
- , Lun-Hui Hu
- & Cui-Zu Chang
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Article |
Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5
The manuscript reports on the experimental observation of a Lifshitz transition in a topological insulator HfTe5 subject to a strong magnetic field, which results in the formation of topological one-dimensional Weyl modes in the bulk of a three-dimensional material.
- Wenbin Wu
- , Zeping Shi
- & Xiang Yuan
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Comment |
Quantum materials at the crossroads of strong correlation and topology
Quantum materials show emergent electronic properties and related functions that are profoundly described by quantum mechanics beyond the semi-classical picture of electrons. Here, key developments and progress in the last two decades are surveyed and future challenges outlined.
- Yoshinori Tokura
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Letter |
Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator
We show that an insulating bulk state and helical edge state coexist in Bi4Br4 and that this coexistence persists up to room temperature.
- Nana Shumiya
- , Md Shafayat Hossain
- & M. Zahid Hasan
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Article |
Bimorphic Floquet topological insulators
Departing from common approaches to designing Floquet topological insulators, here the authors present a photonic realization of Floquet topological insulators revealing topological phases that simultaneously support Chern and anomalous topological states.
- Georgios G. Pyrialakos
- , Julius Beck
- & Demetrios N. Christodoulides
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News & Views |
Topological properties that can be heard
The introduction of crystalline defects experimentally reveals elusive signatures of topological phenomena in acoustic metamaterials.
- Marc Serra-Garcia
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Article |
Topological Wannier cycles induced by sub-unit-cell artificial gauge flux in a sonic crystal
Gauge fields are essential for detecting and controlling quantum dynamical systems, but their potential has yet to be fully exploited. Here, the authors insert a single-unit-cell synthetic gauge flux into a sonic crystal with the gauge phase ranging from 0 to 2π, leading to topological Wannier cycles.
- Zhi-Kang Lin
- , Ying Wu
- & Jian-Hua Jiang
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Article |
Integer topological defects organize stresses driving tissue morphogenesis
Integer topological defects promote cellular self-organization, leading to the formation of complex cellular assemblies that trigger cell differentiation and the formation of swirling cellular pillars once differentiation is inhibited. These findings suggest that integer topological defects are important modulators of cellular differentiation and tissue morphogenesis.
- Pau Guillamat
- , Carles Blanch-Mercader
- & Aurélien Roux
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Perspective |
Topological spintronics and magnetoelectronics
This Perspective discusses the interplay between magnetism and topology in condensed matter.
- Qing Lin He
- , Taylor L. Hughes
- & Kang L. Wang
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News & Views |
Weyl fermions promote collective magnetism
The polar magnetic semimetal NdAlSi hosts Weyl fermions that promote helical magnetism, and defines a roadmap for future work on correlated topological matter.
- Max Hirschberger
- & Yoshinori Tokura
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Article |
Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs
The authors demonstrate ultrafast symmetry breaking by optically driven photocurrents.
- N. Sirica
- , P. P. Orth
- & R. P. Prasankumar
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Article |
Sign-tunable anomalous Hall effect induced by two-dimensional symmetry-protected nodal structures in ferromagnetic perovskite thin films
The topological nature of the electronic structure of two-dimensional ferromagnetic SrRuO3 and its relationship to the anomalous Hall effect is explored through transport measurements, angle-resolved photoemission spectroscopy and theoretical modelling.
- Byungmin Sohn
- , Eunwoo Lee
- & Changyoung Kim
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News & Views |
Supercurrents in a topological antiferromagnet
The non-collinear spin structure and nontrivial Berry curvature of Mn3Ge give rise to a long-range supercurrent in superconductor–Mn3Ge–superconductor lateral Josephson junctions.
- Su-Yang Xu
- & Qiong Ma
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Article |
Weyl-mediated helical magnetism in NdAlSi
The Weyl fermions in NdAlSi mediate a helical incommensurate spin density wave, providing a rare example of Weyl-mediated collective phenomena.
- Jonathan Gaudet
- , Hung-Yu Yang
- & Collin L. Broholm
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News & Views |
Controlling topology with strain
Large uniaxial strain drives a sequence of topological phase transitions in the quasi-one-dimensional superconductor TaSe3, paving the way for the reversible control of surface spin currents.
- Phil D. C. King
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Review Article |
Topology and geometry under the nonlinear electromagnetic spotlight
This Review focuses on nonlinear electromagnetic responses that arise from quantum geometry and topology.
- Qiong Ma
- , Adolfo G. Grushin
- & Kenneth S. Burch
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Letter |
Unconventional chiral charge order in kagome superconductor KV3Sb5
An unconventional chiral charge order is observed in a kagome superconductor by scanning tunnelling microscopy. This charge order has unusual magnetic tunability and intertwines with electronic topology.
- Yu-Xiao Jiang
- , Jia-Xin Yin
- & M. Zahid Hasan
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Article |
Thermal chiral anomaly in the magnetic-field-induced ideal Weyl phase of Bi1−xSbx
A thermal signature of the chiral anomaly is reported in an ideal Weyl semimetal.
- Dung Vu
- , Wenjuan Zhang
- & Joseph P. Heremans
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News & Views |
The sound of Weyl hinges
Clever 3D-printed acoustic materials allow probing a new higher-order semimetallic topological phase using audible sound.
- R. Fleury
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Article |
Visualization of the strain-induced topological phase transition in a quasi-one-dimensional superconductor TaSe3
Angle-resolved photoemission spectroscopy is used to track the evolution of the electronic band structure of TaSe3 across a strain-driven topological phase transition.
- Chun Lin
- , Masayuki Ochi
- & Takeshi Kondo
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Article |
Electronic properties of the bulk and surface states of Fe1+yTe1−xSex
The compositional dependence of magnetic, superconducting and topological surface states on an iron-based superconductor is reported.
- Yangmu Li
- , Nader Zaki
- & Igor A. Zaliznyak
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Letter |
Observation of a phononic higher-order Weyl semimetal
Symmetry is utilized to realize a phononic higher-order Weyl semimetal.
- Li Luo
- , Hai-Xiao Wang
- & Jian-Hua Jiang
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News & Views |
Shaking up topology with light
A light-induced topological phase transition is realized in the Dirac semimetal ZrTe5 by coherently driving symmetry-breaking phonons.
- N. S. Sirica
- & R. P. Prasankumar
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Article |
Chirality-driven topological electronic structure of DNA-like materials
An orbital polarization effect is proposed to understand chiral-induced spin selectivity.
- Yizhou Liu
- , Jiewen Xiao
- & Binghai Yan
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Article |
Room-temperature antiskyrmions and sawtooth surface textures in a non-centrosymmetric magnet with S4 symmetry
Antiskyrmions had only been observed in a few Heusler compounds with D2d symmetry. Here a new material, Fe1.9Ni0.9Pd0.2P, in a different symmetry class (S4 symmetry) is reported to host antiskyrmions, as well as sawtooth surface textures and skyrmions.
- Kosuke Karube
- , Licong Peng
- & Yasujiro Taguchi
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Article |
A light-induced phononic symmetry switch and giant dissipationless topological photocurrent in ZrTe5
Femtosecond optical pulses are used to generate coherent phonons that break inversion symmetry and drive anisotropic terahertz photocurrents in the topological material ZrTe5.
- Liang Luo
- , Di Cheng
- & Jigang Wang
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Article |
Evidence for a higher-order topological insulator in a three-dimensional material built from van der Waals stacking of bismuth-halide chains
Angle-resolved photoemission evidence for a three-dimensional higher-order topological insulator is presented. This work demonstrates that stacking configurations can be utilized to realize different topological phases.
- Ryo Noguchi
- , Masaru Kobayashi
- & Takeshi Kondo
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News & Views |
Immediately produced, immortally preserved
A complementary use of cutting-edge techniques reveals an ultrafast generation of topological magnetic textures.
- Taka-hisa Arima
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Comment |
Engineering quantum materials with chiral optical cavities
Strong light–matter coupling in quantum cavities provides a pathway to break fundamental materials symmetries, like time-reversal symmetry in chiral cavities. This Comment discusses the potential to realize non-equilibrium states of matter that have so far been only accessible in ultrafast and ultrastrong laser-driven materials.
- Hannes Hübener
- , Umberto De Giovannini
- & Angel Rubio
Observation of giant non-reciprocal charge transport from quantum Hall states in a topological insulator