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Weak Anti-localization and Quantum Oscillations of Surface States in Topological Insulator Bi2Se2Te
Scientific Reports
  • Lihong Bao, Iowa State University
  • Liang He, University of California, Los Angeles
  • Nicholas R. Meyer, Iowa State University
  • Xufeng Kou, University of California, Los Angeles
  • Peng Zhang, University of California, Berkeley
  • Zhi-gang Chen, University of Queensland
  • Alexei V. Fedorov, University of California, Berkeley
  • Trevor M. Riedemann, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Kang L. Wang, University of California, Los Angeles
  • Gary Tuttle, Iowa State University
  • Faxian Xiu, Iowa State University
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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 ( ∼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 Bi2Se2Te can serve as a suitable topological insulator candidate for achieving intrinsic quantum transport of surface Dirac fermions.

This article is from Scientific Reports 2 (2012): 726, doi:10.1038/srep00726.

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Lihong Bao, Liang He, Nicholas R. Meyer, Xufeng Kou, et al.. "Weak Anti-localization and Quantum Oscillations of Surface States in Topological Insulator Bi2Se2Te" Scientific Reports Vol. 2 (2012) p. 726
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