Fano resonance in electron transport through parallel double quantum dots in the Kondo regime

Guo-Hui Ding, Chul Koo Kim, and Kyun Nahm
Phys. Rev. B 71, 205313 – Published 24 May 2005

Abstract

Electron transport through parallel double quantum dot system with interdot tunneling and strong on-site Coulomb interaction is studied in the Kondo regime by using the finite-U slave boson technique. For a system of quantum dots with degenerate energy levels, the linear conductance reaches the unitary limit (2e2h) due to the Kondo effect at low temperature when interdot tunneling is absent. As the interdot tunneling amplitude increases, the conductance decreases in the singly occupied regime and a conductance plateau structure appears. In the crossover to the doubly occupied regime, the conductance increases to reach a maximum value of G=2e2h. For parallel double dots with different energy levels, we show that the interference effect plays an important role in electron transport. The linear conductance is shown to have an asymmetric line shape of the Fano resonance as a function of gate voltage.

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  • Received 14 December 2004

DOI:https://doi.org/10.1103/PhysRevB.71.205313

©2005 American Physical Society

Authors & Affiliations

Guo-Hui Ding1, Chul Koo Kim1, and Kyun Nahm2

  • 1Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
  • 2Department of Physics, Yonsei University, Wonju 220-710, Korea

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Issue

Vol. 71, Iss. 20 — 15 May 2005

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