Fano resonances and Aharonov-Bohm effects in transport through a square quantum dot molecule

Z. Y. Zeng, F. Claro, and Alejandro Pérez
Phys. Rev. B 65, 085308 – Published 4 February 2002
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Abstract

We study the Aharonov-Bohm effect in a coupled 2×2 quantum dot array with two terminals. A striking conductance dip arising from the Fano interference is found as the energy levels of the intermediate dots are mismatched, which is lifted in the presence of a magnetic flux. A five peak structure is observed in the conductance for large mismatch. The Aharonov-Bohm evolution of the linear conductance strongly depends on the configuration of dot levels and interdot and dot-lead coupling strengths. In addition, the magnetic flux and asymmetry between dot-lead couplings can induce the splitting and combination of the conductance peak(s).

  • Received 23 June 2001

DOI:https://doi.org/10.1103/PhysRevB.65.085308

©2002 American Physical Society

Authors & Affiliations

Z. Y. Zeng1,2, F. Claro1, and Alejandro Pérez1

  • 1Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
  • 2Department of Physics, Hunan Normal University, Changsha 410081, ChinaCCAST (World Laboratory). P. O. Box 8730, Beijing 100080, China

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Vol. 65, Iss. 8 — 15 February 2002

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