Electric control of a canted-antiferromagnetic Chern insulator

  title={Electric control of a canted-antiferromagnetic Chern insulator},
  author={Jiaqi Cai and Dmitry Ovchinnikov and Zaiyao Fei and Minhao He and Tiancheng Song and Zhong Lin and Chong Wang and David H. Cobden and Jiun Haw Chu and Yong-Tao Cui and Cui-Zu Chang and Di Xiao and Jiaqiang Yan and Xiaodong Xu},
  journal={Nature Communications},
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 that exhibits quantized Hall resistance at zero magnetic field. While prior works have focused on ferromagnetic systems, little is known about band topology and its manipulation in antiferromagnets. Here, we report that MnBi2Te4 is a rare platform for realizing a canted-antiferromagnetic (cAFM) Chern insulator with… 
10 Citations

Superconducting Proximity in Intrinsic Magnetic Topological Insulator MnBi2Te4-NbN Hybrid Device Modulated by Coulomb Blockade Effect.

The combination of nontrivial topology, magnetism, and superconductivity could offer the potential to realize exotic excitations of quasiparticles. MnBi2Te4, as an intrinsic magnetic topological

Anomalous Landau quantization in intrinsic magnetic topological insulators

The intrinsic magnetic topological insulators, Mn(Bi 1- x Sb x ) 2 Te 4 , in their spin-aligned strong field configuration have been identified as a Weyl semimetal with single pair of Weyl nodes 1-4

Magnons and magnetic fluctuations in atomically thin MnBi2Te4

Electron band topology is combined with intrinsic magnetic orders in MnBi2Te4, leading to novel quantum phases. Here we investigate collective spin excitations (i.e. magnons) and spin fluctuations in

Identifying Axion Insulator by Quantized Magnetoelectric Effect in Antiferromagnetic ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ Tunnel Junction

Intrinsic magnetic topological insulator MnBi2Te4 is believed to be an axion insulator in its antiferromagnetic ground state. However, direct identification of axion insulators remains experimentally

Quantum interference in a superconductor-${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$-superconductor Josephson junction

We study the transport properties of a Josephson junction consisting of two identical s -wave superconductors separated by an even-layer MnBi 2 Te 4 (MBT). Using recursive Green’s function method, we



Magnetic topological insulators

The importance of global band topology is unequivocally recognized in condensed matter physics, and new states of matter, such as topological insulators, have been discovered. Owing to their bulk

Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4.

This work establishes one-to-one correspondence between bulk electronic structure, magnetic state, topological order, and layer thickness in atomically thin MnBi2Te4 devices and sheds new light on the interplay between band topology and magnetic order in this newly discovered topological magnet.

Quantum Hall states stabilized in semi-magnetic bilayers of topological insulators

Here, the tailored-material approach for the realization of robust quantum Hall states in the bilayer system is demonstrated, in which the cooperative or cancelling combination of the anomalous and ordinary Hall responses from the respective magnetic and non-magnetic layers is exemplified.

Berry curvature engineering by gating two-dimensional antiferromagnets

Recent advances in tuning electronic, magnetic, and topological properties of two-dimensional (2D) magnets have opened a new frontier in the study of quantum physics and promised exciting

Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4

This work probes quantum transport in MnBi2Te4 thin flakes—a topological insulator with intrinsic magnetic order that becomes ferromagnetic when the sample has an odd number of septuple layers and establishes MnBi 2Te4 as an ideal arena for further exploring various topological phenomena with a spontaneously broken time-reversal symmetry.

Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator MnBi2Te4

$\mathrm{MnBi_2Te_4}$ has recently been established as an intrinsic antiferromagnetic (AFM) topological insulator and predicted to be an ideal platform to realize quantum anomalous Hall (QAH)

Electrical control of 2D magnetism in bilayer CrI3

Electrical control of magnetism in a bilayer of CrI3 enables the realization of an electrically driven magnetic phase transition and the observation of the magneto-optical Kerr effect in 2D magnets.

Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator

The observation of the quantum anomalous Hall (QAH) effect in thin films of chromium-doped (Bi,Sb)2Te3, a magnetic topological insulator shows a plateau in the Hall resistance as a function of the gating voltage without any applied magnetic fields, signifying the achievement of the QAH state.

Experimental Realization of an Intrinsic Magnetic Topological Insulator*

Intrinsic magnetic topological insulator (TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut

Intrinsic magnetic topological insulators in van der Waals layered MnBi2Te4-family materials

This work predicts a series of van der Waals layered MnBi2Te4-related materials that show intralayer ferromagnetic and interlayer antiferromagnetic exchange interactions that could profoundly change future research and technology of topological quantum physics.