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

Cai, Shu; Guo, Jing; Sidorov, Vladimir A.; Zhou, Yazhou; Wang, Honghong; Lin, Gongchang; Wu, Qi; Li, Yanchuan; Li, Xiaodong; Yang, Ke; Li, Aiguo; Hu, Jiangping; Kushwaha, Satya Kumar; Cava, R. J.; Sun, Liling

doi:10.1038/s41535-018-0134-z

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

Journal Article · Fri Nov 23 00:00:00 EST 2018 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-018-0134-z· OSTI ID:1544710

Cai, Shu ^[1]; Guo, Jing ^[2]; Sidorov, Vladimir A. ^[3]; Zhou, Yazhou ^[2]; Wang, Honghong ^[1]; Lin, Gongchang ^[1]; Wu, Qi ^[2]; Li, Yanchuan ^[2]; Li, Xiaodong ^[2]; Yang, Ke ^[2]; Li, Aiguo ^[2]; Hu, Jiangping ^[1];

^[4]; Cava, R. J. ^[5]; Sun, Liling ^[6]

Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Russian Academy of Sciences (RAS), Moscow (Russian Federation)
Princeton Univ., NJ (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
Princeton Univ., NJ (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab., Guangdong (China)

The archetypical 3D topological insulators Bi₂Se₃, Bi₂Te₃, and Sb₂Te₃ commonly exhibit high bulk conductivities, hindering the characterization of the surface state charge transport. The optimally doped topological insulators Bi₂Te₂Se and Bi_2-xSb_xTe₂S, 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 Bi₂Te₂Se and Bi_1.1Sb_0.9Te₂S, 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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1544710

Report Number(s):: LA-UR-19-26035

Journal Information:: npj Quantum Materials, Vol. 3, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Theory of two-fluid metallicity in superconducting FeSe at high pressure Craco, L.; Leoni, S. Physical Review B, Vol. 100, Issue 12 https://doi.org/10.1103/physrevb.100.121101	journal	September 2019
Perfect transmission and Aharanov-Bohm oscillations in topological insulator nanowires with nonuniform cross section Xypakis, Emmanouil; Rhim, Jun-Won; Bardarson, Jens H. Physical Review B, Vol. 101, Issue 4 https://doi.org/10.1103/physrevb.101.045401	journal	January 2020
Perfect transmission and Aharanov-Bohm oscillations in topological insulator nanowires with nonuniform cross section Xypakis, Emmanouil; Rhim, Jun-Won; Bardarson, Jens H. arXiv https://doi.org/10.48550/arxiv.1712.06478	text	January 2017

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