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[期刊论文]

Spin polarization transport through a four InAs quantum dots system irradiated by terahertz light field

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author:

Liu, Na (Liu, Na.) [1] | Bai, Jiyuan (Bai, Jiyuan.) [2] | Bai, Yunfeng (Bai, Yunfeng.) [3] | Unfold

Indexed by:

EI Scopus SCIE

Abstract:

We design a four InAs quantum dot system in which two leads are irradiated by terahertz light fields. The average current through the system is obtained by means of non-equilibrium Green's function theory. Typical photonassisted tunneling is observed in the current energy spectrum. 100% polarization can be achieved by adjusting the intensity of Zeeman magnetic field or the amplitude of terahertz light field. As the frequency of terahertz light field is invariant, a zero current can be obtained by adjusting the amplitude of the terahertz light field, indicating an optically controlled quantum switch device. The spin polarization can be converted between 0 and 1 by tuning the energy level of quantum dots, suggesting a physical scheme of a polarization pulse device. Moreover, the system can be constructed as a terahertz detector due to the oscillation properties of spin polarization. The present work sheds lights onto the design of quantum computing and spin-dependent quantum devices.

Keyword:

Green ?s function InAs quantum dots Optically controlled quantum switch Photon -assisted tunneling Terahertz detector Zeeman magnetic field

Community:

  • [ 1 ] [Liu, Na]Yangtze Normal Univ, Sch Elect & Informat Engn, Chongqing 408003, Peoples R China
  • [ 2 ] [Bai, Jiyuan]Yangtze Normal Univ, Sch Elect & Informat Engn, Chongqing 408003, Peoples R China
  • [ 3 ] [Bai, Yunfeng]Yangtze Normal Univ, Sch Elect & Informat Engn, Chongqing 408003, Peoples R China
  • [ 4 ] [He, Zelong]Yangtze Normal Univ, Sch Elect & Informat Engn, Chongqing 408003, Peoples R China
  • [ 5 ] [Chen, Kongfa]Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350108, Fujian, Peoples R China

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Source :

PHYSICA B-CONDENSED MATTER

ISSN: 0921-4526

Year: 2022

Volume: 641

2 . 8

JCR@2022

2 . 8 0 0

JCR@2023

ESI Discipline: PHYSICS;

ESI HC Threshold:55

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 2

SCOPUS Cited Count: 2

30 Days PV: 0

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