151 citations · 756 across the 29 of their papers we have counts for
29 papers
Surface-switchable nonreciprocity protected by Fermi arcs in Weyl semimetal TaAs
Dong Li, Yuki M. Itahashi, Ying-Ming Xie +12
Weyl semimetals host topologically protected surface states, known as Fermi arcs, which connect bulk Weyl nodes in momentum space. Both bulk Weyl nodes and Fermi arcs are anticipat…
Floquet spin textures in optically pumped non-Hermitian surface states
Xiao-Xiao Zhang, Naoto Nagaosa
Optical effects of quantum matter with interaction are key to physics and technology. The class of non-Hermitian (NH) phenomena is mostly explored in cold atoms, photonics, and met…
This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface
Ilya Belopolski, Ryota Watanabe, Yuki Sato +19
Quantum materials governed by emergent topological fermions have become a cornerstone of physics. Dirac fermions in graphene form the basis for moiré quantum matter, and Dirac ferm…
Nonmonotonic Hall effect of Weyl semimetals under magnetic field
Xiao-Xiao Zhang, Naoto Nagaosa
Hall effect of topological quantum materials often reveals essential new physics and possesses potential for application. Magnetic Weyl semimetal is one especially interesting exam…
Surface spectroscopy and surface-bulk hybridization of Weyl semimetals
Xiao-Xiao Zhang, Naoto Nagaosa
Weyl semimetal showing open-arc surface states is a prominent example of topological quantum matter in three dimensions. With the bulk-boundary correspondence present, nontrivial s…
Topological spin textures in electronic non-Hermitian systems
Xiao-Xiao Zhang, Naoto Nagaosa
Non-Hermitian systems have been discussed mostly in the context of open systems and nonequilibrium. Recent experimental progress is much from optical, cold-atomic, and classical pl…
Exciton-magnon splitting in van der Waals antiferromagnet MnPS unveiled by second-harmonic generation
Ziqian Wang, Xiao-Xiao Zhang, Yuki Shiomi +4
Ultrafast and coherent generation of magnons is of great significance for high-speed antiferromagnetic spintronics. One possible route is by exciton-magnon pairwise optical excitat…
Topological circuit of a versatile non-Hermitian quantum system
David-Andres Galeano, Xiao-Xiao Zhang, Jorge Mahecha
We propose an resistors, inductors and capacitors (RLC) electrical circuit to theoretically analyze and fully simulate a new type of non-Hermitian Su-Schrieffer-Heeger (SSH) model…
Anisotropic three-dimensional quantum Hall effect and magnetotransport in mesoscopic Weyl semimetals
Xiao-Xiao Zhang, Naoto Nagaosa
Weyl semimetals are emerging to become a new class of quantum-material platform for various novel phenomena. Especially, the Weyl orbit made from surface Fermi arcs and bulk relati…
Thickness-dependent spin bistable transitions in single-crystalline molecular 2D material
John Koptur-Palenchar, Miguel Gakiya-Teruya, Duy Le +7
The advent of two-dimensional (2D) crystals has led to numerous scientific breakthroughs. Conventional 2D systems have in-plane covalent bonds and a weak out-of-plane van-der-Waals…
Nonequilibrium topological spin textures in momentum space
Xiao-Xiao Zhang, Naoto Nagaosa
Nonequilibrium quantum dynamics of many-body systems is the frontier of condensed matter physics; recent advances in various time-resolved spectroscopic techniques continue to reve…
Magnetic suppression of non-Hermitian skin effects
Ming Lu, Xiao-Xiao Zhang, Marcel Franz
Skin effect, where macroscopically many bulk states are aggregated towards the system boundary, is one of the most important and distinguishing phenomena in non-Hermitian quantum s…
Ultrafast excitation and topological soliton formation in incommensurate charge density wave states
Xiao-Xiao Zhang, Dirk Manske, Naoto Nagaosa
Topological soliton is a nonperturbative excitation in commensurate density wave states and connects degenerate ground states. In incommensurate density wave states, ground states…
Spin dynamics slowdown near the antiferromagnetic critical point in atomically thin FePS3
Xiao-Xiao Zhang, Shengwei Jiang, Jinhwan Lee +3
Two-dimensional (2D) magnetic materials have attracted much recent interest with unique properties emerging at the few-layer limit. Beyond the reported impacts on the static magnet…
Probing time reversal symmetry breaking topological superconductivity in twisted double layer copper oxides with polar Kerr effect
Oguzhan Can, Xiao-Xiao Zhang, Catherine Kallin +1
Recent theoretical work predicted emergence of chiral topological superconducting phase with spontaneously broken time reversal symmetry in a twisted bilayer composed of two high-$…
Dissipative Berry phase effect in quantum tunneling
Xiao-Xiao Zhang, Naoto Nagaosa
Berry phase effect plays a central role in many mesoscale condensed matter and quantum chemical systems that are naturally under the environmental influence of dissipation. We prop…
Gate-tunable spin waves in antiferromagnetic atomic bilayers
Xiao-Xiao Zhang, Lizhong Li, Daniel Weber +3
The emergence of two-dimensional (2D) layered magnetic materials has opened an exciting playground for both fundamental studies of magnetism in 2D and explorations of spinbased app…
Current-assisted Raman activation of the Higgs mode in superconductors
Matteo Puviani, Lukas Schwarz, Xiao-Xiao Zhang +2
The Higgs mode in superconductors is a scalar mode without electric or magnetic dipole moment. Thus, it is commonly believed that its excitation is restricted to a nonlinear two-ph…
Controllable pn junctions in threedimensional Dirac semimetal CdAs nanowires
Janice Ruth Bayogan, Kidong Park, Zhuo Bin Siu +11
We demonstrate a controllable pn junction in a threedimensional Dirac semimetal (DSM) CdAs nanowire with two recessed bottom gates. The device exhibits four different…
Non-Hermitian exceptional Landau quantization in electric circuits
Xiao-Xiao Zhang, Marcel Franz
Alternating current RLC electric circuits form an accessible and highly tunable platform simulating Hermitian as well as non-Hermitian (nH) quantum systems. We propose here a circu…
Dispersive Landau levels and valley currents in strained graphene nanoribbons
Étienne Lantagne-Hurtubise, Xiao-Xiao Zhang, Marcel Franz
We describe a simple setup generating pure valley currents -- valley transport without charge transport -- in strained graphene nanoribbons with zigzag edges. The crucial ingredien…
Quantum dots formed in three-dimensional Dirac semimetal CdAs nanowires
Minkyung Jung, Kenji Yoshida, Kidong Park +9
We demonstrate quantum dot (QD) formation in three-dimensional Dirac semimetal CdAs nanowires using two electrostatically tuned pn junctions with a gate and magnetic…
Electronic scattering, focusing, and resonance by a spherical barrier in Weyl semimetals
Ming Lu, Xiao-Xiao Zhang
We solve the Weyl electron scattered by a spherical step potential barrier. Tuning the incident energy and the potential radius, one can enter both quasiclassical and quantum regim…
Instability and topological robustness of Weyl semimetals against Coulomb interaction
Fei Xue, Xiao-Xiao Zhang
There is a close connection between various new phenomena in Weyl semimetals and the existence of linear band crossings in the single particle description. We show, by a full self-…