Tunable surface conductivity in Bi2Se3 revealed in diffusive electron transport

被引：234

作者：

Chen, J. ^{[1
,2
]}

He, X. Y. ^{[1
,2
]}

Wu, K. H. ^{[1
,2
]}

Ji, Z. Q. ^{[1
,2
]}

Lu, L. ^{[1
,2
]}

Shi, J. R. ^{[3
]}

Smet, J. H. ^{[4
]}

Li, Y. Q. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[2] Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

[4] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 24期

关键词：

TOPOLOGICAL INSULATOR NANORIBBONS; SPIN-ORBIT SCATTERING; SINGLE DIRAC CONE; MAGNETORESISTANCE; STATES; BI2TE3; LOCALIZATION; SYSTEMS;

D O I：

10.1103/PhysRevB.83.241304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：4

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