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author:

Lang, X. (Lang, X..) [1] | Yu, J. (Yu, J..) [2] (Scholars:俞金玲) | Hong, X. (Hong, X..) [3] | Chen, Y. (Chen, Y..) [4] | Cheng, S. (Cheng, S..) [5] | Lai, Y. (Lai, Y..) [6] | He, K. (He, K..) [7] | Xue, Q. (Xue, Q..) [8]

Indexed by:

Scopus

Abstract:

Three-dimensional (3D) topological insulators (TIs) have attracted much attention due to their topologically protected surface states. Here, we use circularly polarized light to induce the photo-induced anomalous Hall effect (PAHE) in 3D TIs Sb2Te3 thin films with different thicknesses of 5, 7, 12 and 20 quintuple layers (QLs) at room temperature. The dependence of PAHE current on the light spot locations of Sb2Te3 thin films is investigated, which is found to show a completely different behavior from that observed in two-dimensional electron gas (2DEG) systems. This is due to the fact that the total PAHE current is the superposition of the PAHE of the top and bottom surface states. A theoretical model has been proposed to separate the PAHE current of the top and bottom surface states. In addition, as the thickness of the Sb2Te3 film increases from 5 QL to 20 QL, the PAHE currents of the top and bottom surface states first increase and then decrease. The photo-induced anomalous Hall, conductivity of the top surface states in the 7-QL Sb2Te3 film excited by 1064 nm light is as large as 592 nA⋅ V−1⋅ cm ⋅ W−1, which is much larger than that observed in InGaAs/AlGaAs quantum wells (4.45 nA⋅ V−1⋅ cm ⋅ W−1) and GaN/AlGaN heterostructures (1.43 nA⋅ V−1⋅ cm ⋅ W−1). The giant PAHE value observed in Sb2Te3 films suggests that 3D TIs may provide a good platform for spintronic devices. © 2023 Elsevier B.V.

Keyword:

Photo-induced anomalous Hall effects Sb2Te3 Spatial distribution Top and bottom surface states Topological insulators

Community:

  • [ 1 ] [Lang, X.]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 2 ] [Yu, J.]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 3 ] [Hong, X.]Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, China
  • [ 4 ] [Chen, Y.]Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
  • [ 5 ] [Chen, Y.]College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
  • [ 6 ] [Cheng, S.]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 7 ] [Cheng, S.]Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Jiangsu, Changzhou, 213164, China
  • [ 8 ] [Lai, Y.]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 9 ] [He, K.]Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, China
  • [ 10 ] [Xue, Q.]Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, China

Reprint 's Address:

  • 俞金玲

    [Yu, J.]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, China

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Source :

Physica E: Low-Dimensional Systems and Nanostructures

ISSN: 1386-9477

Year: 2023

Volume: 150

2 . 9

JCR@2023

2 . 9 0 0

JCR@2023

ESI HC Threshold:30

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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