Journal
NATURE MATERIALS
Volume 14, Issue 5, Pages 473-477Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4204
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Funding
- NSF [DMR-1207469, DMR-0907007, ECCS-1402738, DMR-1103159]
- ONR [N00014-13-1-0301]
- NSF (Penn State MRSEC) [DMR-0820404, DMR-1420620]
- DOE [DE-AC02-76SF00515]
- DARPA [N66001-11-1-4105]
- STC Center for Integrated Quantum Materials under NSF [DMR-1231319]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1103159, 1207469] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [GRANTS:13651328] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1402738] Funding Source: National Science Foundation
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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(1,2). 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(3-16). Here, we report the experimental observation of the QAH state in V-doped (Bi,Sb)(2)Te-3 films with the zero-field longitudinal resistance down to 0.00013 +/- 0.00007h/e(2) (similar to 3.35 +/- 1.76 Omega), Hall conductance reaching 0.9998 +/- 0.0006e(2) / h and the Hall angle becoming as high as 89.993 degrees +/- 0.004 degrees 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 (H-c > 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.
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