Weak Anti-localization and Quantum Oscillations of Surface States in Topological Insulator Bi2Se2Te

TitleWeak Anti-localization and Quantum Oscillations of Surface States in Topological Insulator Bi2Se2Te
Publication TypeJournal Article
Year of Publication2012
AuthorsBao LH, He L, Meyer N, Kou XF, Zhang P, Chen ZG, Fedorov AV, Zou J, Riedemann TM, Lograsso TA, Wang KL, Tuttle G, Xiu FX
Journal TitleScientific Reports
Volume2
Pages726
Date Published10
Type of ArticleArticle
ISBN Number2045-2322
Accession NumberWOS:000309957400003
Keywordsbi2te3, crystal-structure, limit, nanoribbons, phase, single dirac cone
Abstract

Topological insulators, a new quantum state of matter, create exciting opportunities for studying topological quantum physics and for exploring spintronic applications due to their gapless helical metallic surface states. Here, we report the observation of weak anti-localization and quantum oscillations originated from surface states in Bi2Se2Te crystals. Angle-resolved photoemission spectroscopy measurements on cleaved Bi2Se2Te crystals show a well-defined linear dispersion without intersection of the conduction band. The measured weak anti-localization effect agrees well with the Hikami-Larkin-Nagaoka model and the extracted phase coherent length shows a power-law dependence with temperature (l(phi) similar to T-0.44), indicating the presence of the surface states. More importantly, the analysis of a Landau-level fan diagram of Shubnikov-de Hass oscillations yields a finite Berry phase of similar to 0.42 pi, suggesting the Dirac nature of the surface states. Our results demonstrate that Bi2Se2Te can serve as a suitable topological insulator candidate for achieving intrinsic quantum transport of surface Dirac fermions.

URL<Go to ISI>://WOS:000309957400003
DOI10.1038/srep00726
Alternate JournalSci Rep