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Journal Article

Tunable surface conductivity in Bi2Se3 revealed in diffusive electron transport

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Chen,  J.
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;

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Smet,  J. H.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Research Group Solid State Nanophysics (Jurgen H. Smet), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Chen, J., He, X. Y., Wu, K. H., Ji, Z. Q., Lu, L., Shi, J. R., et al. (2011). Tunable surface conductivity in Bi2Se3 revealed in diffusive electron transport. Physical Review B, 83(24): 241304.


Cite as: https://hdl.handle.net/21.11116/0000-000E-BE77-7
Abstract
We demonstrate that the weak antilocalization effect can serve as a convenient method for detecting decoupled surface transport in topological insulator thin films. In the regime where a bulk Fermi surface coexists with the surface states, the low-field magnetoconductivity is well described by the Hikami-Larkin-Nagaoka equation for single-component transport of noninteracting electrons. When the electron density is lowered, the magnetotransport behavior deviates from the single-component description and strong evidence is found for independent conducting channels at or near the bottom and top surfaces. The magnetic-field-dependent part of corrections to conductivity due to Zeeman energy is shown to be negligible for the fields relevant to the weak antilocalization despite considerable electron-electron interaction effects on the temperature dependence of the conductivity.