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Title: Anomalous helicity-dependent photocurrent in the topological insulator ( Bi 0.5 Sb 0.5 ) 2 Te 3 on a GaAs substrate [Spin manipulation at the interface of a topological insulator and a non-magnetic semiconductor]

We present that the emerging material, topological insulator, has provided new opportunities for spintronic applications, owing to its strong spin-orbit character. Topological insulator based heterostructures that display spin-charge coupling driven by topology at surfaces have great potential for the realization of novel spintronic devices. Here, we report the observation of anomalous photogalvanic effect in (Bi 0.5Sb 0.5) 2Te 3 thin films grown on GaAs substrate. We demonstrate that the magnitude, direction, and temperature dependence of the helicity-dependent photocurrent (HDPC) can be modulated by the gate voltage. From spatially resolved photocurrent measurements, we show that the line profile of HDPC in (Bi 0.5Sb 0.5) 2Te 3/GaAs is unaffected by the variation of beam size, in contrast to the photocurrent response measured in a (Bi 0.5Sb 0.5) 2Te 3/mica structure.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States). Department of Electrical Engineering
Publication Date:
Report Number(s):
LLNL-JRNL-697157
Journal ID: ISSN 2469-9950; PRBMDO; 827767
Grant/Contract Number:
AC52-07NA27344; 15-LW-018; 16-SI-004
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1458665
Alternate Identifier(s):
OSTI ID: 1417929

Qu, Dong-Xia, Che, Xiaoyu, Kou, Xufeng, Pan, Lei, Crowhurst, Jonathan, Armstrong, Michael R., Dubois, Jonathan, Wang, Kang L., and Chapline, George F.. Anomalous helicity-dependent photocurrent in the topological insulator (Bi0.5Sb0.5)2Te3 on a GaAs substrate [Spin manipulation at the interface of a topological insulator and a non-magnetic semiconductor]. United States: N. p., Web. doi:10.1103/PhysRevB.97.045308.
Qu, Dong-Xia, Che, Xiaoyu, Kou, Xufeng, Pan, Lei, Crowhurst, Jonathan, Armstrong, Michael R., Dubois, Jonathan, Wang, Kang L., & Chapline, George F.. Anomalous helicity-dependent photocurrent in the topological insulator (Bi0.5Sb0.5)2Te3 on a GaAs substrate [Spin manipulation at the interface of a topological insulator and a non-magnetic semiconductor]. United States. doi:10.1103/PhysRevB.97.045308.
Qu, Dong-Xia, Che, Xiaoyu, Kou, Xufeng, Pan, Lei, Crowhurst, Jonathan, Armstrong, Michael R., Dubois, Jonathan, Wang, Kang L., and Chapline, George F.. 2018. "Anomalous helicity-dependent photocurrent in the topological insulator (Bi0.5Sb0.5)2Te3 on a GaAs substrate [Spin manipulation at the interface of a topological insulator and a non-magnetic semiconductor]". United States. doi:10.1103/PhysRevB.97.045308.
@article{osti_1458665,
title = {Anomalous helicity-dependent photocurrent in the topological insulator (Bi0.5Sb0.5)2Te3 on a GaAs substrate [Spin manipulation at the interface of a topological insulator and a non-magnetic semiconductor]},
author = {Qu, Dong-Xia and Che, Xiaoyu and Kou, Xufeng and Pan, Lei and Crowhurst, Jonathan and Armstrong, Michael R. and Dubois, Jonathan and Wang, Kang L. and Chapline, George F.},
abstractNote = {We present that the emerging material, topological insulator, has provided new opportunities for spintronic applications, owing to its strong spin-orbit character. Topological insulator based heterostructures that display spin-charge coupling driven by topology at surfaces have great potential for the realization of novel spintronic devices. Here, we report the observation of anomalous photogalvanic effect in (Bi0.5Sb0.5)2Te3 thin films grown on GaAs substrate. We demonstrate that the magnitude, direction, and temperature dependence of the helicity-dependent photocurrent (HDPC) can be modulated by the gate voltage. From spatially resolved photocurrent measurements, we show that the line profile of HDPC in (Bi0.5Sb0.5)2Te3/GaAs is unaffected by the variation of beam size, in contrast to the photocurrent response measured in a (Bi0.5Sb0.5)2Te3/mica structure.},
doi = {10.1103/PhysRevB.97.045308},
journal = {Physical Review B},
number = 4,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010

Control over topological insulator photocurrents with light polarization
journal, December 2011
  • McIver, J. W.; Hsieh, D.; Steinberg, H.
  • Nature Nanotechnology, Vol. 7, Issue 2, p. 96-100
  • DOI: 10.1038/nnano.2011.214

Quantum Oscillations and Hall Anomaly of Surface States in the Topological Insulator Bi2Te3
journal, July 2010