Localized states in a semiconductor quantum ring with a tangent wire

Yang, F.

doi:10.1063/1.4893938

Title: Localized states in a semiconductor quantum ring with a tangent wire

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Abstract

We extend a special kind of localized state trapped at the intersection due to the geometric confinement, first proposed in a three-terminal-opening T-shaped structure [L. A. Openov, Europhys. Lett. 55, 539 (2001)], into a ring geometry with a tangent connection to the wire. In this ring geometry, there exists one localized state trapped at the intersection with energy lying inside the lowest subband. We systematically study this localized state and the resulting Fano-type interference due to the coupling between this localized state and the continuum ones. It is found that the increase of inner radius of the ring weakens the coupling to the continuum ones and the asymmetric Fano dip fades away. A wide energy gap in transmission appears due to the interplay of two types of antiresonances: the Fano-type antiresonance and the structure antiresonance. The size of this antiresonance gap can be modulated by adjusting the magnetic flux. Moreover, a large transmission amplitude can be obtained in the same gap area. The strong robustness of the antiresonance gap is demonstrated and shows the feasibility of the proposed geometry for a real application.

Authors:: Yang, F.

Publication Date:: Thu Aug 28 00:00:00 EDT 2014

OSTI Identifier:: 22314335

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 116; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; ASYMMETRY; ENERGY GAP; GEOMETRY; INTERFERENCE; MAGNETIC FLUX; SEMICONDUCTOR MATERIALS; TRANSMISSION; TRAPPING; WIRES

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                    Yang, F., and Wu, M. W., E-mail: mwwu@ustc.edu.cn. Localized states in a semiconductor quantum ring with a tangent wire.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4893938.

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                    Yang, F., & Wu, M. W., E-mail: mwwu@ustc.edu.cn. Localized states in a semiconductor quantum ring with a tangent wire.  United States.  https://doi.org/10.1063/1.4893938

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                    Yang, F., and Wu, M. W., E-mail: mwwu@ustc.edu.cn. 2014.  
        "Localized states in a semiconductor quantum ring with a tangent wire".  United States.  https://doi.org/10.1063/1.4893938.

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@article{osti_22314335,

  title        = {Localized states in a semiconductor quantum ring with a tangent wire},

  author       = {Yang, F. and Wu, M. W., E-mail: mwwu@ustc.edu.cn},

  abstractNote = {We extend a special kind of localized state trapped at the intersection due to the geometric confinement, first proposed in a three-terminal-opening T-shaped structure [L. A. Openov, Europhys. Lett. 55, 539 (2001)], into a ring geometry with a tangent connection to the wire. In this ring geometry, there exists one localized state trapped at the intersection with energy lying inside the lowest subband. We systematically study this localized state and the resulting Fano-type interference due to the coupling between this localized state and the continuum ones. It is found that the increase of inner radius of the ring weakens the coupling to the continuum ones and the asymmetric Fano dip fades away. A wide energy gap in transmission appears due to the interplay of two types of antiresonances: the Fano-type antiresonance and the structure antiresonance. The size of this antiresonance gap can be modulated by adjusting the magnetic flux. Moreover, a large transmission amplitude can be obtained in the same gap area. The strong robustness of the antiresonance gap is demonstrated and shows the feasibility of the proposed geometry for a real application.},

  doi          = {10.1063/1.4893938},

  url          = {https://www.osti.gov/biblio/22314335},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 8,

  volume       = 116,

  place        = {United States},

  year         = {Thu Aug 28 00:00:00 EDT 2014},

  month        = {Thu Aug 28 00:00:00 EDT 2014}

}

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