Weak anti-localization and quantum oscillations of surface states in topological insulator Bi 2Se 2Te
Article
Article Title | Weak anti-localization and quantum oscillations of surface states in topological insulator Bi 2Se 2Te |
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ERA Journal ID | 201487 |
Article Category | Article |
Authors | Bao, Lihong (Author), He, Liang (Author), Meyer, Nicholas (Author), Kou, Xufeng (Author), Zhang, Peng (Author), Chen, Zhi-Gang (Author), Fedorov, Alexei V. (Author), Zou, Jin (Author), Riedemann, Trevor M. (Author), Lograsso, Thomas A. (Author), Tuttle, Gary (Author), Wang, Kang L. (Author) and Xiu, Faxian (Author) |
Journal Title | Scientific Reports |
Journal Citation | 2 |
Number of Pages | 7 |
Year | 2012 |
Publisher | Nature Publishing Group |
Place of Publication | United Kingdom |
ISSN | 2045-2322 |
Digital Object Identifier (DOI) | https://doi.org/10.1038/srep00726 |
Web Address (URL) | http://www.nature.com/articles/srep00726.pdf?proof=true |
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 Bi 2Se 2Te crystals. Angle-resolved photoemission spectroscopy measurements on cleaved Bi 2Se 2Te 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 (∼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 ∼0.42π, suggesting the Dirac nature of the surface states. Our results demonstrate that Bi 2Se 2Te can serve as a suitable topological insulator candidate for achieving intrinsic quantum transport of surface Dirac fermions. |
Keywords | GaAs growth behaviour; Au nanoparticles; GaAs {111}B substrate; electron microscopy |
ANZSRC Field of Research 2020 | 519999. Other physical sciences not elsewhere classified |
349999. Other chemical sciences not elsewhere classified | |
Byline Affiliations | Iowa State University, United States |
University of California, United States | |
Lawrence Berkeley National Laboratory, United States | |
University of Queensland | |
Ames National Laboratory, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4184/weak-anti-localization-and-quantum-oscillations-of-surface-states-in-topological-insulator-bi-2se-2te
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