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Robustness of a Topologically Protected Surface State in a Sb2Te2Se Single Crystal.

ABSTRACT: A topological insulator (TI) is a quantum material in a new class with attractive properties for physical and technological applications. Here we derive the electronic structure of highly crystalline Sb2Te2Se single crystals studied with angle-resolved photoemission spectra. The result of band mapping reveals that the Sb2Te2Se compound behaves as a p-type semiconductor and has an isolated Dirac cone of a topological surface state, which is highly favored for spintronic and thermoelectric devices because of the dissipation-less surface state and the decreased scattering from bulk bands. More importantly, the topological surface state and doping level in Sb2Te2Se are difficult to alter for a cleaved surface exposed to air; the robustness of the topological surface state defined in our data indicates that this Sb2Te2Se compound has a great potential for future atmospheric applications.

SUBMITTER: Lee CK 

PROVIDER: S-EPMC5114659 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

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Robustness of a Topologically Protected Surface State in a Sb<sub>2</sub>Te<sub>2</sub>Se Single Crystal.

Lee Chao-Kuei CK   Cheng Cheng-Maw CM   Weng Shih-Chang SC   Chen Wei-Chuan WC   Tsuei Ku-Ding KD   Yu Shih-Hsun SH   Chou Mitch Ming-Chi MM   Chang Ching-Wen CW   Tu Li-Wei LW   Yang Hung-Duen HD   Luo Chih-Wei CW   Gospodinov Marin M MM  

Scientific reports 20161118

A topological insulator (TI) is a quantum material in a new class with attractive properties for physical and technological applications. Here we derive the electronic structure of highly crystalline Sb<sub>2</sub>Te<sub>2</sub>Se single crystals studied with angle-resolved photoemission spectra. The result of band mapping reveals that the Sb<sub>2</sub>Te<sub>2</sub>Se compound behaves as a p-type semiconductor and has an isolated Dirac cone of a topological surface state, which is highly favor  ...[more]

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