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Independence of topological surface state and bulk conductance in three-dimensional topological insulators

Author(s): Cai, Shu; Guo, Jing; Sidorov, Vladimir A.; Zhou, Yazhou; Wang, Honghong; et al

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Abstract: © 2018, The Author(s). The archetypical 3D topological insulators Bi 2 Se 3 , Bi 2 Te 3 , and Sb 2 Te 3 commonly exhibit high bulk conductivities, hindering the characterization of the surface state charge transport. The optimally doped topological insulators Bi 2 Te 2 Se and Bi 2−x Sb x Te 2 S, however, allow for such characterizations to be made. Here we report an experimental comparison of the conductance for the topological surface and bulk states in Bi 2 Te 2 Se and Bi 1.1 Sb 0.9 Te 2 S, based on temperature-dependent high-pressure measurements. We find that the surface state conductance at low temperature remains constant in the face of orders of magnitude increase in the bulk state conductance, revealing in a straightforward way that the topological surface states and bulk states are decoupled at low temperatures, consistent with theoretical models, and confirming topological insulators to be an excellent venue for studying charge transport in 2D Dirac electron systems.
Publication Date: 1-Dec-2018
Electronic Publication Date: 23-Nov-2018
Citation: Cai, S., Guo, J., Sidorov, V.A., Zhou, Y., Wang, H., Lin, G., Li, X., Li, Y., Yang, K., Li, A., Wu, Q., Hu, J., Kushwaha, S.K., Cava, R.J., Sun, L. (2018). Independence of topological surface state and bulk conductance in three-dimensional topological insulators. npj Quantum Materials, 3 (1), 10.1038/s41535-018-0134-z
DOI: doi:10.1038/s41535-018-0134-z
EISSN: 2397-4648
Pages: 3.1:62,1-6
Type of Material: Journal Article
Journal/Proceeding Title: npj Quantum Materials
Version: Final published version. This is an open access article.
Notes: npj Quantum Materials. Volume 3, Issue 1, 1 December 2018, Article number 62.

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