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author:

Lang, Xinjie (Lang, Xinjie.) [1] | Yu, Jinling (Yu, Jinling.) [2] (Scholars:俞金玲) | Hong, Xiyu (Hong, Xiyu.) [3] | Chen, Yonghai (Chen, Yonghai.) [4] | Cheng, Shuying (Cheng, Shuying.) [5] (Scholars:程树英) | Lai, Yunfeng (Lai, Yunfeng.) [6] (Scholars:赖云锋) | He, Ke (He, Ke.) [7] | Xue, Qikun (Xue, Qikun.) [8]

Indexed by:

EI Scopus SCIE

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 & BULL; V-1 & BULL; cm & BULL; W-1, which is much larger than that observed in InGaAs/AlGaAs quantum wells (4.45 nA & BULL; V-1 & BULL; cm & BULL; W-1) and GaN/AlGaN heterostructures (1.43 nA & BULL; V-1 & BULL; cm & BULL; W-1). The giant PAHE value observed in Sb2Te3 films suggests that 3D TIs may provide a good platform for spintronic devices.

Keyword:

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

Community:

  • [ 1 ] [Lang, Xinjie]Fuzhou Univ, Inst Micro Nano Devices & Solar Cells, Sch Phys & Informat Engn, Fuzhou 350108, Peoples R China
  • [ 2 ] [Yu, Jinling]Fuzhou Univ, Inst Micro Nano Devices & Solar Cells, Sch Phys & Informat Engn, Fuzhou 350108, Peoples R China
  • [ 3 ] [Cheng, Shuying]Fuzhou Univ, Inst Micro Nano Devices & Solar Cells, Sch Phys & Informat Engn, Fuzhou 350108, Peoples R China
  • [ 4 ] [Lai, Yunfeng]Fuzhou Univ, Inst Micro Nano Devices & Solar Cells, Sch Phys & Informat Engn, Fuzhou 350108, Peoples R China
  • [ 5 ] [Hong, Xiyu]Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
  • [ 6 ] [He, Ke]Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
  • [ 7 ] [Xue, Qikun]Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
  • [ 8 ] [Chen, Yonghai]Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing 100083, Peoples R China
  • [ 9 ] [Chen, Yonghai]Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China
  • [ 10 ] [Cheng, Shuying]Changzhou Univ, Jiangsu Collaborat Innovat Ctr Photovolat Sci & En, Changzhou 213164, Jiangsu, Peoples R China

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Source :

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES

ISSN: 1386-9477

Year: 2023

Volume: 150

2 . 9

JCR@2023

2 . 9 0 0

JCR@2023

ESI Discipline: PHYSICS;

ESI HC Threshold:30

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 0

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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