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Swapping Kondo resonances in coupled double quantum dots

Guang-Ming Zhang, Rong Lü, Zhi-Rong Liu, and Lu Yu
Phys. Rev. B 72, 073308 – Published 19 August 2005
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    Abstract

    Strong electron and spin correlations are studied in parallel-coupled double quantum dots with interdot spin superexchange J. In the Kondo regime with degenerate dot energy levels, coherent transport occurs at zero temperature, where two entangled (bonding and antibonding) resonances are formed near the Fermi energy. When increasing J or the dot-lead parallel-coupling asymmetry ratio Γ2∕Γ1, a swap between two entangled resonances occurs and the line shapes of the transmission are interchanged. The linear conductance shows a peak at the critical values. Such a peculiar effect with the virtue of many-body coherence may be useful in future quantum computing.

      • Received 3 March 2005

      DOI:https://doi.org/10.1103/PhysRevB.72.073308

      ©2005 American Physical Society

      Authors & Affiliations

      Guang-Ming Zhang1,2, Rong Lü2, Zhi-Rong Liu1, and Lu Yu3,2

      • 1Department of Physics, Tsinghua University, Beijing 100084, China
      • 2Center for Advanced Study, Tsinghua University, Beijing 100084, China
      • 3Interdisciplinary Center of Theoretical Studies and Institute of Theoretical Physics, CAS, Beijing 100080, China

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      Issue

      Vol. 72, Iss. 7 — 15 August 2005

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      Images

      • Figure 1
        Configuration of the coupled double quantum dots with asymmetric couplings to the left and right electrodes. Two degenerate dot levels (ϵ1=ϵ2) are coupled by an AF spin superexchange with strong on-site Coulomb repulsion.Reuse & Permissions
      • Figure 2
        The order parameter Δf in the Kondo regime (ϵd=−6) as functions of the asymmetry ratio of the dot-lead couplings Γ2 in (a) and the ISS J in (b). The ground-state phase diagram is given in (c). Γ1=1 is the energy unit.Reuse & Permissions
      • Figure 3
        The dot DOS and the corresponding transmission for different interdot AF spin superexchange J with a given asymmetry ratio of the dot-lead couplings Γ2=0.6 and degenerate dot energy levels ϵd=−6.Reuse & Permissions
      • Figure 4
        The linear conductance as a function of the asymmetry ratio of coupling parameters Γ2 and the ISS J with degenerate dot energy level ϵd=−6.Reuse & Permissions
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