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Scale-invariant quantum anomalous Hall effect in magnetic topological insulators beyond the two-dimensional limit.
- Source :
-
Physical review letters [Phys Rev Lett] 2014 Sep 26; Vol. 113 (13), pp. 137201. Date of Electronic Publication: 2014 Sep 26. - Publication Year :
- 2014
-
Abstract
- We investigate the quantum anomalous Hall effect (QAHE) and related chiral transport in the millimeter-size (Cr(0.12)Bi(0.26)Sb(0.62))₂Te₃ films. With high sample quality and robust magnetism at low temperatures, the quantized Hall conductance of e²/h is found to persist even when the film thickness is beyond the two-dimensional (2D) hybridization limit. Meanwhile, the Chern insulator-featured chiral edge conduction is manifested by the nonlocal transport measurements. In contrast to the 2D hybridized thin film, an additional weakly field-dependent longitudinal resistance is observed in the ten-quintuple-layer film, suggesting the influence of the film thickness on the dissipative edge channel in the QAHE regime. The extension of the QAHE into the three-dimensional thickness region addresses the universality of this quantum transport phenomenon and motivates the exploration of new QAHE phases with tunable Chern numbers. In addition, the observation of scale-invariant dissipationless chiral propagation on a macroscopic scale makes a major stride towards ideal low-power interconnect applications.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 113
- Issue :
- 13
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 25302915
- Full Text :
- https://doi.org/10.1103/PhysRevLett.113.137201