Journal Article

FZJ-2021-00204

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High-temperature quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3 superlattice

Deng, H. ; Chen, Z. ; Wołoś, A. ; Konczykowski, M. ; Sobczak, K. ; Sitnicka, J. ; Fedorchenko, I. V. ; Borysiuk, J. ; Heider, T.FZJ* ; Pluciński, Ł. ; Park, K. ; Georgescu, A. B. ; Cano, J. ; Krusin-Elbaum, L. (Corresponding author)

2021
Nature Publishing Group Basingstoke

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Please use a persistent id in citations: http://hdl.handle.net/2128/27071  doi:10.1038/s41567-020-0998-2

Abstract: The quantum anomalous Hall effect1,2 is a fundamental transport response of a topological insulator in zero magnetic field. Its physical origin is a result of an intrinsically inverted electronic band structure and ferromagnetism3, and its most important manifestation is the dissipationless flow of chiral charge currents at the edges of the system4, a property that has the potential to transform future quantum electronics5,6. Here, we report a Berry-curvature-driven4,7 anomalous Hall regime at temperatures of several Kelvin in the magnetic topological bulk crystals in which Mn ions self-organize into a period-ordered MnBi2Te4/Bi2Te3 superlattice. Robust ferromagnetism of the MnBi2Te4 monolayers opens a surface gap8,9,10, and when the Fermi level is tuned to be within this gap, the anomalous Hall conductance reaches an e2/h quantization plateau, which is a clear indication of chiral transport through the edge states. The quantization in this regime is not obstructed by the bulk conduction channels and therefore should be present in a broad family of topological magnets.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 20 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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