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Title: | Discovery of highly spin-polarized conducting surface states in the strong spin-orbit coupling semiconductor Sb 2 Se 3 |
Authors: | Das, Shekhar Sirohi, Anshu Kamboj, S. Vasdev, Aastha Sheet, G. |
Keywords: | Sb2Se3 Spin-orbit coupling Semiconductor Surface states |
Issue Date: | 2018 |
Publisher: | American Physical Society |
Citation: | Physical Review B, 97(23). |
Abstract: | Majority of the A2B3-type chalcogenide systems with strong spin-orbit coupling (SOC), such as Bi2Se3,Bi2Te3, and Sb2Te3, etc., are topological insulators. One important exception is Sb2Se3 where a topological nontrivial phase was argued to be possible under ambient conditions, but such a phase could be detected to exist only under pressure. In this paper, we show that Sb2Se3 like Bi2Se3 displays a generation of highly spin-polarized current under mesoscopic superconducting point contacts as measured by point-contact Andreev reflection spectroscopy. In addition, we observe a large negative and anisotropic magnetoresistance of the mesoscopic metallic point contacts formed on Sb2Se3. Our band-structure calculations confirm the trivial nature of Sb2Se3 crystals and reveal two trivial surface states one of which shows large spin splitting due to Rashba-type SOC. The observed high spin polarization and related phenomena in Sb2Se3 can be attributed to this spin splitting. |
Description: | Only IISERM authors are available in the record. |
URI: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.235306 http://hdl.handle.net/123456789/2012 |
Appears in Collections: | Research Articles |
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