TY  - JOUR
AU  - Deng, Haiming
AU  - Chen, Zhiyi
AU  - Wołoś, Agnieszka
AU  - Konczykowski, Marcin
AU  - Sobczak, Kamil
AU  - Sitnicka, Joanna
AU  - Fedorchenko, Irina V.
AU  - Borysiuk, Jolanta
AU  - Heider, Tristan
AU  - Pluciński, Łukasz
AU  - Park, Kyungwha
AU  - Georgescu, Alexandru B.
AU  - Cano, Jennifer
AU  - Krusin-Elbaum, Lia
TI  - High-temperature quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3 superlattice
JO  - Nature physics
VL  - 17
IS  - 1
SN  - 1745-2481
CY  - Basingstoke
PB  - Nature Publishing Group
M1  - FZJ-2021-00204
SP  - 36 - 42
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000560934900007
DO  - DOI:10.1038/s41567-020-0998-2
UR  - https://juser.fz-juelich.de/record/889312
ER  -