Enhanced surface mobility and quantum oscillations in topological insulator Bi1.5Sb0.5Te1.7Se1.3 nanoflakes
Journal article, 2013

n this study, a series of Bi1.5Sb0.5Te 1.7Se1.3 (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.


Te-Chih Hsiung

Academia Sinica

Chen Ding Yuan

Academia Sinica

Li Zhao

Academia Sinica

Yi-Hsin Lin

Academia Sinica

Chung-Yu Mou

National Tsing Hua University

Ting-Kuo Lee

Academia Sinica

Maw-Kuen Wu

Academia Sinica

Yang-Yuan Chen

Academia Sinica

Applied Physics Letters

0003-6951 (ISSN) 1077-3118 (eISSN)

Vol. 103 16 163111

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics



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2/9/2022 1