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Magnetic flux tuning of Fano-Kondo interplay in a parallel double quantum dot system

机译:平行双量子点系统中Fano-Kondo相互作用的磁通量调整

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We investigate the Fano-Kondo interplay in an Aharonov-Bohm ring with an embedded noninteracting quantum dot and a Coulomb interacting quantum dot. Using a slave-boson mean-field approximation we diagonalize the Hamiltonian via scattering matrix theory and derive the conductance in the form of a Fano expression, which depends on the mean-field parameters. We predict that in the Kondo regime the magnetic field leads to a gapped energy level spectrum due to hybridization of the noninteracting QD state and the Kondo state, and can quantum-mechanically alter the electron's path preference. We demonstrate that an abrupt symmetry change in the Fano resonance, as seen experimentally, could be a consequence of an underlying Kondo channel.
机译:我们研究了具有嵌入式非相互作用量子点和库仑相互作用量子点的Aharonov-Bohm环中的Fano-Kondo相互作用。使用从玻色子平均场近似,我们通过散射矩阵理论将哈密顿量对角化,并以Fano表达式的形式导出电导,这取决于平均场参数。我们预测,在近藤状态下,由于非相互作用的QD状态和近藤状态的混合,磁场导致能隙能级谱变大,并且可以量子力学地改变电子的路径偏好。我们证明,如实验所见,Fano共振中的突然对称变化可能是潜在的近藤通道的结果。

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  • 来源
    《Physical review》 |2013年第23期|235407.1-235407.6|共6页
  • 作者单位

    Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands;

    Kavli Institute ofNanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands,Centrefor Quantum Computation and Communication Technology, University of New South Wales, Sydney NSW 2052, Australia;

    Kavli Institute ofNanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands,Centrefor Quantum Computation and Communication Technology, University of New South Wales, Sydney NSW 2052, Australia;

    Kavli Institute ofNanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands;

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