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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/25984
Title: Strong spin-orbit coupling and Zeeman spin splitting in angle dependent magnetoresistance of Bi2Te3
Authors: Dey R.
Pramanik, Tanmoy
Roy A.
Rai A.
Guchhait S.
Sonde S.
Movva H.C.P.
Colombo L.
Register L.F.
Banerjee S.K.
Published in: Applied Physics Letters
Abstract: We have studied angle dependent magnetoresistance of Bi2Te 3 thin film with field up to 9 T over 2-20 K temperatures. The perpendicular field magnetoresistance has been explained by the Hikami-Larkin-Nagaoka theory alone in a system with strong spin-orbit coupling, from which we have estimated the mean free path, the phase coherence length, and the spin-orbit relaxation time. We have obtained the out-of-plane spin-orbit relaxation time to be small and the in-plane spin-orbit relaxation time to be comparable to the momentum relaxation time. The estimation of these charge and spin transport parameters are useful for spintronics applications. For parallel field magnetoresistance, we have confirmed the presence of Zeeman effect which is otherwise suppressed in perpendicular field magnetoresistance due to strong spin-orbit coupling. The parallel field data have been explained using both the contributions from the Maekawa-Fukuyama localization theory for non-interacting electrons and Lee-Ramakrishnan theory of electron-electron interactions. The estimated Zeeman g-factor and the strength of Coulomb screening parameter agree well with the theory. Finally, the anisotropy in magnetoresistance with respect to angle has been described by the Hikami-Larkin-Nagaoka theory. This anisotropy can be used in anisotropic magnetic sensor applications. © 2014 AIP Publishing LLC.
Citation: Applied Physics Letters, 104(22)
URI: https://doi.org/10.1063/1.4881721
http://repository.iitr.ac.in/handle/123456789/25984
Issue Date: 2014
Publisher: American Institute of Physics Inc.
Keywords: Algorithms
Anisotropy
Electron-electron interactions
Parameter estimation
Relaxation time
Coulomb screening
Localization theory
Momentum relaxation
Phase-coherence length
Sensor applications
Spin-orbit couplings
Spintronics application
Zeeman spin splitting
Magnetoresistance
ISSN: 36951
Author Scopus IDs: 57225425824
55938287000
35180233300
55672148400
6602542843
26221975300
51764085900
7102464650
35598581900
55566203800
Author Affiliations: Dey, R., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Pramanik, T., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Roy, A., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Rai, A., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Guchhait, S., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Sonde, S., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Movva, H.C.P., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Colombo, L., Texas Instruments, Dallas, TX 75243, United States
Register, L.F., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Banerjee, S.K., Microelectronics Research Center, University of Texas at Austin, Austin, TX 78758, United States
Funding Details: 
Appears in Collections:Journal Publications [ECE]

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