Advertisement

Journal of Computational Electronics

, Volume 4, Issue 1–2, pp 129–133 | Cite as

Fano Resonance Through Quantum Dots in Tunable Aharonov-Bohm Rings

  • Y. S. JoeEmail author
  • J. S Kim
  • E. R. Hedin
  • R. M. Cosby
  • A. M. Satanin
Article

Abstract

Stimulated by recent intriguing experiments with a quantum dot in an Aharonov-Bohm (AB) ring, we investigate novel resonant phenomena by studying the total transmission probability of nanoscale AB rings with an embedded scattering center in one arm and a magnetic flux passing through its center. In the AB ring with double coupled-quantum dots (QDs), we show that the overlapping of Fano resonances arises from the strong interaction between two quasi-bound levels in the coupled QDs, and that the zero of the Fano resonance is shifted to the complex plane. In addition, we also study the effects of an asymmetry in the arm by inserting an attractive potential well (dot) in one arm. The combined transmission resonance effects as functions of variables of the ring structure and the potential are presented. It is shown that an attractive potential in one of the arms in the AB ring generates an asymmetric Fano resonance in the transmission.

Keywords

Fano resonance Aharonov-Bohm ring quantum dot 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    1. K. Kobayashi, H. Aikawa, S. Katsumoto, and Y. Iye, Phys. Rev. Lett., 85, 256806 (2002).CrossRefGoogle Scholar
  2. 2.
    2. M. Sigrist, A. Fuhrer, T. Ihn, K. Ensslin, W. Wegscheider, and M. Bichler, Physica E, 22, 530 (2004).Google Scholar
  3. 3.
    3. U.F. Keyser, S. Borck, R.J. Haug, M. Bichler, G. Abstreiter, and W. Wegscheider, Semiconductor Science and Technology, 17, L22 (2002).CrossRefGoogle Scholar
  4. 4.
    4. C.S. Kim, A.M. Satanin, Y.S. Joe, and R.M. Cosby, Phys. Rev. B, 60, 10962 (1999).CrossRefGoogle Scholar
  5. 5.
    5. E.R. Hedin, R.M. Cosby, A.M. Satanin, and Y.S. Joe, J. Appl. Phys., 97, 063712 (2005).CrossRefGoogle Scholar
  6. 6.
    6. Z. Shao, W. Porod, and C.S. Lent, Phys. Rev. B, 49, 7453 (1994).Google Scholar

Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Y. S. Joe
    • 1
    Email author
  • J. S Kim
    • 1
  • E. R. Hedin
    • 1
  • R. M. Cosby
    • 1
  • A. M. Satanin
    • 2
    • 3
  1. 1.Center for Computational Nanoscience, Department of Physics and AstronomyBall State UniversityMuncieUSA
  2. 2.Center for Computational Nanoscience, Department of Physics and AstronomyBall State UniversityMuncieUSA
  3. 3.Institute for Physics of MicrostructuresNizhny NovgorodRussia

Personalised recommendations