Quantum interference effects and electron-electron interactions are found to play an important role in two-dimensional (2D) bulk transport of topological insulator (TI) thin films, which were previously considered as 2D electron gas (2DEG) and explained on basis of Hikami-Larkin-Nagaoka formula and Lee-Ramakrishnan theory. The distinct massive Dirac-type band structure of the TI bulk state gives rise to quantum corrections to conductivity due to interference and interaction effects, which are quite different from that of a 2DEG. We interpret the experimental findings employing Lu-Shen theory particularly derived for the TI system in the 2D limit. The surface and the bulk conductions are identified based on slopes of logarithmic temperature-dependent conductivities with magnetic fields. The perpendicular field magnetoresistance is analyzed considering suppression of weak antilocalization/localization of the surface/bulk electrons by the applied field. We propose corresponding theoretical models to explain the parallel and tilted field magnetoresistance. The effect of the band structure is found to be crucial for an accurate explanation of the magnetotransport results in the TI thin film.
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28 October 2016
Research Article|
October 24 2016
Localization and interaction effects of epitaxial Bi2Se3 bulk states in two-dimensional limit
Rik Dey;
Rik Dey
a)
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Anupam Roy;
Anupam Roy
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Tanmoy Pramanik;
Tanmoy Pramanik
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Samaresh Guchhait;
Samaresh Guchhait
b)
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Sushant Sonde;
Sushant Sonde
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Amritesh Rai;
Amritesh Rai
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Leonard F. Register;
Leonard F. Register
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Sanjay K. Banerjee
Sanjay K. Banerjee
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
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Rik Dey
a)
Anupam Roy
Tanmoy Pramanik
Samaresh Guchhait
b)
Sushant Sonde
Amritesh Rai
Leonard F. Register
Sanjay K. Banerjee
Microelectronics Research Center,
University of Texas at Austin
, Austin, Texas 78758, USA
a)
Electronic mail: [email protected]
b)
Present addresses: Laboratory for Physical Sciences, College Park, Maryland 20740, USA and Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
J. Appl. Phys. 120, 164301 (2016)
Article history
Received:
May 24 2016
Accepted:
October 08 2016
Citation
Rik Dey, Anupam Roy, Tanmoy Pramanik, Samaresh Guchhait, Sushant Sonde, Amritesh Rai, Leonard F. Register, Sanjay K. Banerjee; Localization and interaction effects of epitaxial Bi2Se3 bulk states in two-dimensional limit. J. Appl. Phys. 28 October 2016; 120 (16): 164301. https://doi.org/10.1063/1.4965861
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