Quantum anomalous Hall effect in time-reversal-symmetry breaking topological insulators

CZ Chang, M Li - Journal of Physics: Condensed Matter, 2016 - iopscience.iop.org
The quantum anomalous Hall effect (QAHE), the last member of Hall family, was predicted to
exhibit quantized Hall conductivity ${{\sigma} _ {yx}}=\frac {{{e}^{2}}}{h} $ without any …

Even–Odd Layer-Dependent Exchange Bias Effect in MnBi2Te4 Chern Insulator Devices

B Chen, X Liu, Y Li, H Tay, T Taniguchi… - Nano Letters, 2024 - ACS Publications
Magnetic topological materials with coexisting magnetism and nontrivial band structures
exhibit many novel quantum phenomena, including the quantum anomalous Hall effect, the …

Proximity-driven enhanced magnetic order at ferromagnetic-insulator–magnetic-topological-insulator interface

M Li, CZ Chang, BJ Kirby, ME Jamer, W Cui, L Wu… - Physical review …, 2015 - APS
Magnetic exchange driven proximity effect at a magnetic-insulator–topological-insulator (MI-
TI) interface provides a rich playground for novel phenomena as well as a way to realize low …

Experimental Verification of the Van Vleck Nature of Long-Range Ferromagnetic Order in the Vanadium-Doped Three-Dimensional Topological Insulator

M Li, CZ Chang, L Wu, J Tao, W Zhao, MHW Chan… - Physical Review Letters, 2015 - APS
We demonstrate by high resolution low temperature electron energy loss spectroscopy
(EELS) measurements that the long range ferromagnetic (FM) order in the vanadium-(V-) …

Perfect Andreev reflection due to the Klein paradox in a topological superconducting state

S Lee, V Stanev, X Zhang, D Stasak, J Flowers… - Nature, 2019 - nature.com
In 1928, Dirac proposed a wave equation to describe relativistic electrons. Shortly
afterwards, Klein solved a simple potential step problem for the Dirac equation and …

[HTML][HTML] Structural and proximity-induced ferromagnetic properties of topological insulator-magnetic insulator heterostructures

Z Jiang, CZ Chang, C Tang, JG Zheng, JS Moodera… - AIP Advances, 2016 - pubs.aip.org
The spontaneously broken time reversal symmetry can lead to the formation of an energy
gap in the Dirac spectrum of the surface states of a topological insulator (TI) which can …

Negative Longitudinal Magnetoresistance from the Anomalous Landau Level in Topological Materials

BA Assaf, T Phuphachong, E Kampert, VV Volobuev… - Physical review …, 2017 - APS
Negative longitudinal magnetoresistance (NLMR) is shown to occur in topological materials
in the extreme quantum limit, when a magnetic field is applied parallel to the excitation …

Proximity induced band gap opening in topological-magnetic heterostructure (Ni80Fe20/p-TlBiSe2/p-Si) under ambient condition

R Singh, GK Maurya, V Gautam, R Kumar, M Kumar… - Scientific Reports, 2023 - nature.com
The broken time reversal symmetry states may result in the opening of a band gap in
TlBiSe2 leading to several interesting phenomena which are potentially relevant for …

Proximity-induced magnetism and an anomalous Hall effect in Bi 2 Se 3/LaCoO 3: A topological insulator/ferromagnetic insulator thin film heterostructure

S Zhu, D Meng, G Liang, G Shi, P Zhao, P Cheng, Y Li… - Nanoscale, 2018 - pubs.rsc.org
Inducing magnetism in a topological insulator (TI) by exchange coupling with a
ferromagnetic insulator (FMI) will break the time-reversal symmetry of topological surface …

Observation of interfacial antiferromagnetic coupling between magnetic topological insulator and antiferromagnetic insulator

F Wang, D Xiao, W Yuan, J Jiang, YF Zhao, L Zhang… - Nano …, 2019 - ACS Publications
Inducing magnetic orders in a topological insulator (TI) to break its time reversal symmetry
has been predicted to reveal many exotic topological quantum phenomena. The …