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Nanoscale magnetic domains in polycrystalline Mn3Sn films imaged by a scanning single-spin magnetometer
Senlei Li, Mengqi Huang, Hanyi Lu +7
Noncollinear antiferromagnets with novel magnetic orders, vanishingly small net magnetization and exotic spin related properties hold enormous promise for developing next-generatio…
Quantum sensing and imaging of spin-orbit-torque-driven spin dynamics in noncollinear antiferromagnet Mn3Sn
Gerald Q. Yan, Senlei Li, Hanyi Lu +8
Novel noncollinear antiferromagnets with spontaneous time-reversal symmetry breaking, nontrivial band topology, and unconventional transport properties have received immense resear…
Large Anomalous Hall Effect in Topological Insulators Proximitized by Collinear Antiferromagnets
Chao Lei, Hua Chen, Allan H. MacDonald
CrSb is an attractive material for room-temperature antiferromagnetic spintronic applications because of its high Néel temperature 700 K and semi-metallic character. We study…
Finite-thickness effect and spin polarization of the even-denominator fractional quantum Hall states
Pengjie Wang, Jian Sun, Hailong Fu +6
The spin-polarized even-denominator fractional quantum Hall (FQH) states in the second Landau level (LL), i.e. 5/2 and 7/2, may possess novel quasi-particle excitations obeying non…
Quantum Anomalous Hall Effect through Canted Antiferromagnetism
Xiao Li, Allan H. MacDonald, Hua Chen
Most canted antiferromagnets are also anomalous Hall antiferromagnets (AHE AFMs), i.e. they have an anomalous Hall response and other responses with the same symmetry requirements.…
Emergent flat band lattices in spatially periodic magnetic fields
M. Tahir, Olivier Pinaud, Hua Chen
Motivated by the recent discovery of Mott insulating phase and unconventional superconductivity due to the flat bands in twisted bilayer graphene, we propose more generic ways of g…
Spin Hall effects without spin currents in magnetic insulators
Hua Chen, Qian Niu, Allan H. MacDonald
The spin Hall effect (SHE) is normally discussed in terms of a spin current, which is ill-defined in strongly spin-orbit-coupled systems because of spin non-conservation. In this w…
Manipulating Anomalous Hall Antiferromagnets with Magnetic Fields
Hua Chen, Tzu-Cheng Wang, Di Xiao +3
The symmetry considerations that imply a non-zero anomalous Hall effect (AHE) in certain non-collinear antiferromagnets also imply both non-zero orbital magnetization and a net spi…
Ultrathin Films of Superconducting Metals as a Platform for Topological Superconductivity
Chao Lei, Hua Chen, Allan H. MacDonald
The ingredients normally required to achieve topological superconductivity (TSC) are Cooper pairing, broken inversion symmetry, and broken time-reversal symmetry. We present a theo…
Topological Dirac states beyond orbitals for silicene on SiC(0001) surface
Ping Li, Xiao Li, Wei Zhao +6
The discovery of intriguing properties related to the Dirac states in graphene has spurred huge interest in exploring its two-dimensional group-IV counterparts, such as silicene, g…
Geometric Dynamics of Magnetization: Electronic Contribution
Bangguo Xiong, Hua Chen, Xiao Li +1
To give a general description of the influences of electric fields or currents on magnetization dynamics, we developed a semiclassical theory for the magnetization implicitly coupl…
Stability of the bubble states in Corbino geometry under a tilted field
Pengjie Wang, Yijia Wu, Hua Chen +6
We measured the activation energy gap of the N = 2 bubble states using tilted-field technique in two GaAs/AlGaAs samples with Corbino geometry, and observed monotonically decreasin…
Spin-Superfluidity and Spin-Current Mediated Non-Local Transport
Hua Chen, Allan H. MacDonald
Some strategies for reducing energy consumption in information processing devices involve the use of spin rather than charge to carry information. This idea is especially attractiv…
Strong interface-induced spin-orbit coupling in graphene on WS2
Zhe Wang, Dong-Keun Ki, Hua Chen +3
Interfacial interactions allow the electronic properties of graphene to be modified, as recently demonstrated by the appearance of satellite Dirac cones in the band structure of gr…
Quantum Anomalous Hall Effect in Graphene Proximity Coupled to an Antiferromagnetic Insulator
Zhenhua Qiao, Wei Ren, Hua Chen +4
We propose realizing the quantum anomalous Hall effect by proximity coupling graphene to an antiferromagnetic insulator that provides both broken time-reversal symmetry and spin-or…
Theory of Transport Phenomena in Coherent Quantum Hall Bilayers
I. Sodemann, H. Chen, A. H. MacDonald
We argue that all anomalous transport properties of coherent quantum quantum Hall bilayers can be understood in terms of a mean-field transport theory in which the condensate phase…
Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
Stevan Nadj-Perge, Ilya K. Drozdov, Jian Li +6
Majorana fermions are predicted to localize at the edge of a topological superconductor, a state of matter that can form when a ferromagnetic system is placed in proximity to a con…
Topological Superconductivity induced by Ferromagnetic Metal Chains
Jian Li, Hua Chen, Ilya K. Drozdov +3
Recent experiments have provided evidence that one-dimensional (1D) topological superconductivity can be realized experimentally by placing transition metal atoms that form a ferro…
Non-Local Transport Mediated by Spin-Supercurrents
Hua Chen, Andrew D. Kent, Allan H. MacDonald +1
In thin film ferromagnets with perfect easy-plane anisotropy, the component of total spin perpendicular to the easy plane is a good quantum number and the corresponding spin superc…
Contrasting Behavior of Carbon Nucleation in the Initial Stages of Graphene Epitaxial Growth on Stepped Metal Surfaces
Hua Chen, Wenguang Zhu, Zhenyu Zhang
Using first-principles calculations within density functional theory, we study the energetics and kinetics of carbon nucleation in the early stages of epitaxial graphene growth on…
Quasiparticle tunneling in the Moore-Read fractional quantum Hall State
Hua Chen, Zi-Xiang Hu, Kun Yang +2
In fractional quantum Hall systems, quasiparticles of fractional charge can tunnel between the edges at a quantum point contact. Such tunneling (or backscattering) processes contri…
Ground state and edge excitations of quantum Hall liquid at filling factor 2/3
Zi-Xiang Hu, Hua Chen, Kun Yang +2
We present a numerical study of fractional quantum Hall liquid at Landau level filling factor in a microscopic model including long-range Coulomb interaction and edge confi…