期刊
PHYSICAL REVIEW B
卷 91, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.195310
关键词
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资金
- National Science Foundation [DMR-0907007, ECCS-1402738]
- STC Center for Integrated Quantum Materials under NSF [DMR-1231319]
- [NSF-DMR-1207469]
- [ONR-N00014-13-1-0301]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1402738] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1207469] Funding Source: National Science Foundation
Inducing magnetism onto a topological crystalline insulator (TCI) has been predicted to result in several novel quantum electromagnetic effects. This is a consequence of the highly strain-sensitive band topology of such symmetry-protected systems. We thus show that placing the TCI surface of SnTe in proximity to EuS-a ferromagnetic insulator-induces magnetism at the interface between SnTe and EuS, and thus breaks time-reversal symmetry in the TCI. Magnetotransport experiments on SnTe-EuS-SnTe trilayer devices reveal a hysteretic lowering of the resistance at the TCI surface that coincides with an increase in the density of magnetic domain walls. This additional conduction could be a signature of topologically protected states within domain walls. Additionally, a hysteretic anomalous Hall effect reveals that the usual in-plane magnetic moment of the EuS layer is canted towards a perpendicular direction at the interface. These results are evidence of induced magnetism at the SnTe-EuS interfaces, resulting in broken time-reversal symmetry in the TCI.
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