Journal
NANO LETTERS
Volume 17, Issue 12, Pages 7878-7885Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04172
Keywords
Photoinduced inverse spin Hall effect; surface state; topological insulator; Bi2Se3; two-dimensional electron gas
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Funding
- National Natural Science Foundation of China [61674038, 61306120, 61474114, 11574302]
- National Key Research and Development Program [2016YFB0402303]
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The three-dimensional (3D) topological insulator (TI) Bi2Se3 exhibits topologically protected, linearly dispersing Dirac surface states (SSs). To access the intriguing properties of these SSs, it is important to distinguish them from the coexisting two-dimensional electron gas (2DEG) on the surface. Here, we use circularly polarized light to induce the inverse spin Hall effect in a Bi2Se3 thin film at different temperatures (i.e., from 77 to 300 K). It is demonstrated that the photoinduced inverse spin Hall effect (PISHE) of the top SSs and the 2DEG can be separated based on their opposite signs. The temperature and power dependence of the PISHE also confirms our method. Furthermore, it is found that the PISHE in the 2DEG is dominated by the extrinsic mechanism, as revealed by the temperature dependence of the PISHE.
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