294 citations · 842 across the 27 of their papers we have counts for
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Bulk versus surface: Nonuniversal partitioning of the topological magnetoelectric effect
Chao Lei, Perry T. Mahon, Allan H. MacDonald
The electronic ground state of a three-dimensional (3D) band insulator with time-reversal () symmetry or time-reversal times a discrete translation () symmetry is clas…
Symmetry, topology, and geometry: The many faces of the topological magnetoelectric effect
Perry T. Mahon, Chao Lei, Allan H. MacDonald
A delicate tension complicates the relationship between the topological magnetoelectric effect (TME) in three-dimensional (3D) topological insulators (TIs) and time-…
Pressure tunable quantum anomalous Hall states in a topological antiferromagnet
Su Kong Chong, Chao Lei, Jie Li +8
Mechanical modulation of the lattice parameter can modify the electronic structure and manipulate the magnetic coupling of a material without introducing impurities. Inspired by su…
Kerr, Faraday, and Magnetoelectric Effects in MnBiTe Thin Films
Chao Lei, Allan H. MacDonald
The topological magneto-electric effect (TME) is a characteristic property of topological insulators. In this article, we use a simplified coupled-Dirac-cone electronic structure m…
Anomalous Landau quantization in intrinsic magnetic topological insulators
Su Kong Chong, Chao Lei, Seng Huat Lee +4
The intrinsic magnetic topological insulators, Mn(Bi1-xSbx)2Te4, in their spin-aligned strong field configuration have been identified as a Weyl semimetal with single pair of Weyl…
Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
Mengke Liu, Chao Lei, Hyunsue Kim +5
In intrinsic magnetic topological insulators, Dirac surface state gaps are prerequisites for quantum anomalous Hall and axion insulating states. Unambiguous experimental identifica…
Quantum Anomalous Hall Effect in Perfectly Compensated Collinear Antiferromagnetic Thin Films
Chao Lei, Olle Heinonen, R. J. McQueeney +1
We show that the quantum anomalous Hall effect almost always occurs in magnetic topological insulator thin films whenever the top and bottom surface layer magnetizations are parall…
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…
Silicon Donor Array as a Disordered One-Dimensional Electron Gas
Chao Lei, Allan H. MacDonald
Donors in silicon can now be positioned with an accuracy of about one lattice constant, making it possible in principle to form donor arrays for quantum computation or quantum simu…
Gate-Tunable Quantum Anomalous Hall Effects in MnBiTe Thin Films
Chao Lei, Allan H. MacDonald
The quantum anomalous Hall (QAH) effect has recently been realized in thin films of intrinsic magnetic topological insulators (IMTIs) like MnBiTe. Here we point out that th…
Mirror Symmetry Breaking and Lateral Stacking Shifts in Twisted Trilayer Graphene
Chao Lei, Lukas Linhart, Wei Qin +2
We construct a continuum model of twisted trilayer graphene using {\it ab initio} density-functional-theory calculations, and apply it to address twisted trilayer electronic struct…
Magnetized Topological Insulator Multilayers
Chao Lei, Shu Chen, Allan H. MacDonald
We discuss the magnetic and topological properties of bulk crystals and quasi-two-dimensional thin films formed by stacking intrinsic magnetized topological insulator ( for example…
Majorana Zero Modes in Cylindrical Semiconductor Quantum Wire
Chao Lei, Guru Khalsa, Jiangfeng Du +1
We study Majorana zero modes properties in cylindrical cross-section semiconductor quantum wires based on the theory and a discretized lattice model. Within this model,…
Unveiling Defect-Mediated Carrier Dynamics in Monolayer Semiconductors by Spatiotemporal Microwave Imaging
Zhaodong Chu, Chun-Yuan Wang, Jiamin Quan +13
The optoelectronic properties of atomically thin transition-metal dichalcogenides are strongly correlated with the presence of defects in the materials, which are not necessarily d…
Topological Quantum Computing Using Nanowire Devices
C. Tutschku, R. W. Reinthaler, C. Lei +2
The boundary of topological superconductors might lead to the appearance of Majorana edge modes, whose non-trivial exchange statistics can be used for topological quantum computing…
Magnetoelectric Response of Antiferromagnetic Van der Waals Bilayers
Chao Lei, Bheema Lingam Chittari, Kentaro Nomura +3
We predict that antiferromagnetic bilayers formed from van der Waals (vdW) materials, like bilayer CrI, have a strong magnetoelectric response that can be detected by measuring…
Dynamic axion field in the magnetoelectric antiferromagnet chromia
Junlei Wang, Chao Lei, Allan H Macdonald +1
Chromia is a magnetoelectric insulator whose bulk magnetoelectric susceptibility contains a non-zero pseudoscalar component, like that present in magnetized topological insulators.…
Electronic properties of thin films of tensile strained HgTe
Jihang Zhu, Chao Lei, Allan H. MacDonald
Tensile strained bulk HgTe is a three-dimensional topological insulator. Because of the energetic position of its surface state Dirac points relative to its small bulk gap, the ele…
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…
The Quantum Anomalous Hall Majorana Platform
Yongxin Zeng, Chao Lei, Gaurav Chaudhary +1
We show that quasi-one-dimensional (1D) quantum wires can be written onto the surface of magnetic topological insulator (MTI) thin films by gate arrays. When the MTI is in a quantu…