High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator.
By Cui-Zu Chang, Weiwei Zhao, Duk Y. Kim, Haijun Zhang, B. Assaf, D. Heiman, Shoucheng Zhang, Chaoxing Liu, M. Chan, J. Moodera. Nature Materials, 2014
859 citations recorded by the source corpus.
The discovery of the quantum Hall (QH) effect led to the realization of a topological electronic state with dissipationless currents circulating in one direction along the edge of a two-dimensional electron layer under a strong magnetic field. The quantum anomalous Hall (QAH) effect shares a similar physical phenomenon to that of the QH effect, whereas its physical origin relies on the intrinsic spin-orbit coupling and ferromagnetism. Here, we report the experimental observation of the QAH state in V-doped (Bi,Sb)2Te3 films with the zero-field longitudinal resistance down to 0.00013 ± 0.00007h/e(2) (~3.35 ± 1.76 Ω), Hall conductance reaching 0.9998 ± 0.0006e(2)/h and the Hall angle becoming as high as 89.993° ± 0.004° at T = 25 mK. A further advantage of this system comes from the fact that it is a hard ferromagnet with a large coercive field (Hc > 1.0 T) and a relative high Curie temperature. This realization of a robust QAH state in hard ferromagnetic topological insulators (FMTIs) is a major step towards dissipationless electronic applications in the absence of external fields.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/db048efa6e6de8af43548e52ff1c8c897c1547f1
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Citations in the corpus
- Chemical Aspects of the Candidate Antiferromagnetic Topological Insulator MnBi2Te4 (2018, background): “V-doped samples([7]) showed superior properties compared to Cr, but, nevertheless, the signatures of the QAH state vanished above ~5 K.”
- Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn2As2 and MnBi2nTe3n+1 (2019, background): “The introduction of magnetism into the Z2 TIs can produce more exotic topological quantum phenomena, such as the quantum anomalous Hall effect [8-14], axion insulator states [15-21] and chiral Majorana fermions [22].”
- Colloquium : Quantum anomalous Hall effect (2022, methodology): “The presence of multi-channel side walls was experimentally confirmed by performing the non-local transport measurements on both uniformly 10 QL Cr-doped (Bi, Sb)2Te3 (Kou et al., 2014) and uniformly 4 QL Vdoped (Bi, Sb)2Te3 (Chang et al., 2015a) Hall bar de- vices.”