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Designing Magnetic Topological Insulator Trilayers for Highly-Efficient Spin-Orbit Torque Switching
Ling-Jie Zhou, Deyi Zhuo, Han Tay +5
Spin-orbit torque (SOT) enables efficient electrical control of magnetization, offering a pathway towards low-power spintronic devices. Magnetic topological insulators (TIs), with…
Designer Quantum States in Magnetic Topological Insulator Multilayers
Deyi Zhuo, Han Tay, Cui-Zu Chang
Magnetic topological insulators (TIs) provide a highly tunable platform for engineering quantum states that emerge from the interplay between topology and magnetism. In this review…
Boundary-Bulk Interplay in Nonlinear Topological Transport
Deyi Zhuo, Xiaoda Liu, Huu-Thong Le +7
Nonlinear transport has emerged as a powerful approach to probe the quantum geometry of electronic wavefunctions, such as Berry curvature and quantum metric, in topological materia…
Electrical control of intrinsic nonlinear Hall effect in antiferromagnetic topological insulator sandwiches
Ruobing Mei, Daniel Kaplan, Binghai Yan +2
Nonlinear Hall effect (NHE) can originate from the quantum metric mechanism in antiferromagnetic topological materials with PT symmetry, which has been experimentally observed in M…
Interlayer Exchange Coupling-Induced Critical-Metal-to-Insulator Phase Transition in Quantum Anomalous Hall Insulators
Ruoxi Zhang, Yi-Fan Zhao, Ling-Jie Zhou +6
Interlayer exchange coupling (IEC) between two magnetic layers sandwiched by a nonmagnetic spacer layer plays a critical role in shaping the magnetic properties of such heterostruc…
Engineering Plateau Phase Transition in Quantum Anomalous Hall Multilayers
Deyi Zhuo, Ling-Jie Zhou, Yi-Fan Zhao +7
The plateau phase transition in quantum anomalous Hall (QAH) insulators corresponds to a quantum state wherein a single magnetic domain gives way to multiple magnetic domains and t…
Interface-Induced Superconductivity in Magnetic Topological Insulator-Iron Chalcogenide Heterostructures
Hemian Yi, Yi-Fan Zhao, Ying-Ting Chan +24
When two different electronic materials are brought together, the resultant interface often shows unexpected quantum phenomena, including interfacial superconductivity and Fu-Kane…
Three-Dimensional Quantum Anomalous Hall Effect in Magnetic Topological Insulator Trilayers of Hundred-Nanometer Thickness
Yi-Fan Zhao, Ruoxi Zhang, Zi-Ting Sun +9
Magnetic topological states refer to a class of exotic phases in magnetic materials with their non-trivial topological property determined by magnetic spin configurations. An examp…
Dirac-Fermion-Assisted Interfacial Superconductivity in Epitaxial Topological Insulator/Iron Chalcogenide Heterostructures
Hemian Yi, Lun-Hui Hu, Yi-Fan Zhao +15
Over the last decade, the possibility of realizing topological superconductivity (TSC) has generated much excitement, mainly due to the potential use of its excitations (Majorana z…
Observation of Fractionally Quantized Anomalous Hall Effect
Heonjoon Park, Jiaqi Cai, Eric Anderson +17
The integer quantum anomalous Hall (QAH) effect is a lattice analog of the quantum Hall effect at zero magnetic field. This striking transport phenomenon occurs in electronic syste…
Axion Insulator State in Hundred-Nanometer-Thick Magnetic Topological Insulator Sandwich Heterostructures
Deyi Zhuo, Zi-Jie Yan, Zi-Ting Sun +10
An axion insulator is a three-dimensional (3D) topological insulator (TI), in which the bulk maintains the time-reversal symmetry or inversion symmetry but the surface states are g…
Environmental Doping-Induced Degradation of the Quantum Anomalous Hall Insulators
Han Tay, Yi-Fan Zhao, Ling-Jie Zhou +5
The quantum anomalous Hall (QAH) insulator is a topological quantum state with quantized Hall resistance and zero longitudinal resistance in the absence of an external magnetic fie…
Creation of Chiral Interface Channels for Quantized Transport in Magnetic Topological Insulator Multilayer Heterostructures
Yi-Fan Zhao, Ruoxi Zhang, Jiaqi Cai +6
One-dimensional (1D) topologically protected states are usually formed at the interface between two-dimensional (2D) materials with different topological invariants. Therefore, 1D…
Confinement-Induced Chiral Edge Channel Interaction in Quantum Anomalous Hall Insulators
Ling-Jie Zhou, Ruobing Mei, Yi-Fan Zhao +8
In quantum anomalous Hall (QAH) insulators, the interior is insulating but electrons can travel with zero resistance along one-dimensional conducting paths known as chiral edge cha…
Electrical Switching of the Edge Current Chirality in Quantum Anomalous Hall Insulators
Wei Yuan, Ling-Jie Zhou, Kaijie Yang +9
A quantum anomalous Hall (QAH) insulator is a topological state of matter, in which the interior is insulating but electrical current flows along the edges of the sample, in either…
Proximity-Induced Superconductivity in Epitaxial Topological Insulator/Graphene/Gallium Heterostructures
Cequn Li, Yi-Fan Zhao, Alexander Vera +16
The introduction of superconductivity to the Dirac surface states of a topological insulator leads to a topological superconductor, which may support topological quantum computing…
Evolution of Dopant-Concentration-Induced Magnetic Exchange Interaction in Topological Insulator Thin Films
Fei Wang, Yi-Fan Zhao, Zijie Yan +6
Two essential ingredients for the quantum anomalous Hall (QAH) effect, i.e. topological and magnetic orders, can be combined by doping magnetic ions into a topological insulator (T…
Colloquium: Quantum anomalous Hall effect
Cui-Zu Chang, Chao-Xing Liu, Allan H. MacDonald
The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators - topological…
Selective Trapping of Hexagonally Warped Topological Surface States in a Triangular Quantum Corral
Mu Chen, Yeping Jiang, Junping Peng +10
The surface of a three-dimensional topological insulator (TI) hosts two-dimensional massless Dirac fermions (DFs), the gapless and spin-helical nature of which yields many exotic p…
Zero Magnetic Field Plateau Phase Transition in Higher Chern Number Quantum Anomalous Hall Insulators
Yi-Fan Zhao, Ruoxi Zhang, Ling-Jie Zhou +5
The plateau-to-plateau transition in quantum Hall effect under high magnetic fields is a celebrated quantum phase transition between two topological states through either sweeping…
Electric control of a canted-antiferromagnetic Chern insulator
Jiaqi Cai, Dmitry Ovchinnikov, Zaiyao Fei +11
The interplay between band topology and magnetism can give rise to exotic states of matter. For example, magnetically doped topological insulators can realize a Chern insulator tha…
Mapping the phase diagram of the quantum anomalous Hall and topological Hall effects in a dual-gated magnetic topological insulator heterostructure
Run Xiao, Di Xiao, Jue Jiang +11
We use magnetotransport in dual-gated magnetic topological insulator heterostructures to map out a phase diagram of the topological Hall and quantum anomalous Hall effects as a fun…
Local manifestations of thickness dependent topology and axion edge state in topological magnet MnBiTe
Felix Lüpke, Anh D. Pham, Yi-Fan Zhao +9
The interplay of non-trivial band topology and magnetism gives rise to a series of exotic quantum phenomena, such as the emergent quantum anomalous Hall (QAH) effect and topologica…
Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4
Dmitry Ovchinnikov, Xiong Huang, Zhong Lin +15
The interplay between band topology and magnetic order plays a key role in quantum states of matter. MnBi2Te4, a van der Waals magnet, has recently emerged as an exciting platform…