Local potential fluctuation of topological surface states in Bi1.5Sb0.5Te1.7Se1.3 observed by Landau level spectroscopy
SCIE
SCOPUS
- Title
- Local potential fluctuation of topological surface states in Bi1.5Sb0.5Te1.7Se1.3 observed by Landau level spectroscopy
- Authors
- Ko, W; Park, J; Jeon, I; Kim, HW; Kwon, H; Oh, Y; Kim, JS; Suh, H; Hwang, SW; Chung, C
- Date Issued
- 2016-02-22
- Publisher
- American Institute of Physics
- Abstract
- We report the local observation of the band structure of topological surface states in Bi1.5Sb0.5Te1.7Se1.3 using scanning tunneling microscopy/spectroscopy (STM/STS). The energy-momentum dispersion relation is locally deduced by extracting the Landau level (LL) energies, which are formed in a high magnetic field, from the STS data. Spatial variation of LLs revealed a shift of the Dirac point energy at the nanometer scale. The structure of the potential fluctuation was not correlated with the topography, which indicated that the Te/Se substitution did not induce the potential shift because of their same valence. The results show that disorders from the Te/Se substitution at the surface do not induce any localized charged states and do not affect topological surface states. (C) 2016 AIP Publishing LLC.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29917
- DOI
- 10.1063/1.4942517
- ISSN
- 0003-6951
- Article Type
- Article
- Citation
- APPLIED PHYSICS LETTERS, vol. 108, no. 8, page. 83109, 2016-02-22
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