Reversible tuning of the surface state in a pseudobinary Bi2(Te-Se)3 topological insulator

Journal Article · Fri Aug 10 00:00:00 EDT 2012 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.86.085112· OSTI ID:1053246

Jiang, Rui; Wang, Lin-Lin; Huang, Mianliang; Dhaka, Rajendra S; Johnson, Duane D; Lograsso, Thomas A; Kaminski, Adam

We use angle-resolved photoemission spectroscopy to study a nontrivial surface state in a pseudobinary Bi2Te2.8Se0.2 topological insulator. We show that, unlike previously studied binaries, this is an intrinsic topological insulator with the conduction bulk band residing well above the chemical potential. Our data indicate that under a good vacuum condition there are no significant aging effects for more than two weeks after cleaving. We also demonstrate that the shift of the Kramers point at low temperature is caused by UV-assisted absorption of molecular hydrogen. Our findings pave the way for applications of these materials in devices and present an easy scheme to tune their properties.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1053246
• Report Number(s): IS-J 7787
• Journal Information: Physical Review B, Vol. 86, Issue 8
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE