1. Enhanced surface mobility and quantum oscillations in topological insulator Bi1.5Sb0.5Te1.7Se1.3 nanoflakes
- Author
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Yi-Hsin Lin, Yang-Yuan Chen, Te-Chih Hsiung, Ting-Kuo Lee, L. Zhao, Ding-Yuan Chen, Maw-Kuen Wu, and Chung-Yu Mou
- Subjects
Surface conductivity ,Materials science ,Nanolithography ,Physics and Astronomy (miscellaneous) ,Electrical resistance and conductance ,Condensed matter physics ,Topological insulator ,Conductance ,Quantum oscillations ,Shubnikov–de Haas effect ,Surface states - Abstract
In this study, a series of Bi1.5Sb0.5Te1.7Se1.3 (BSTS) flakes 80-nm to 140-μm in thickness was fabricated to investigate their metallic surface states. We report the observation of surface-dominated transport in these topological insulator BSTS nanoflakes. The achievement of surface-dominated transport can be attributed to high surface mobility (∼3000 cm2/V s) and low bulk mobility (12 cm2/V s). Up to 90% of the total conductance, the surface channel was estimated based on the thickness dependence of electrical conductance and the result of the Shubnikov-de Hass oscillations in a 200-nm BSTS. The nature of nontrivial Dirac surface states was also confirmed by the weak anti-localization effect.
- Published
- 2013
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