Reversible tuning of the surface state in a pseudobinary Bi-2(Te-Se)(3) topological insulator

TitleReversible tuning of the surface state in a pseudobinary Bi-2(Te-Se)(3) topological insulator
Publication TypeJournal Article
Year of Publication2012
AuthorsJiang R, Wang LL, Huang ML, Dhaka RS, Johnson DD, Lograsso TA, Kaminski A
Journal TitlePhysical Review B
Volume86
Pages085112
Date Published08
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000307383200002
KeywordsELECTRON-GAS, energy, phase
Abstract

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.

URL<Go to ISI>://WOS:000307383200002
DOI10.1103/PhysRevB.86.085112
Alternate JournalPhys. Rev. B