Spin and charge Kondo effects in capacitively coupled double quantum dots

We investigate low-temperature spin and charge (orbital) Kondo effect of capacitively hierarchical equations of motion. In a charge stability diagram at finite interdot Coulomb repulsion, a line between triple points (LBTP) serves as the degeneracy of charge configuration states. With one electron d...

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Bibliographic Details
Published in:Europhysics letters 2020-12, Vol.132 (6), p.67001
Main Authors: Sun, F. L., Wei, J. H.
Format: Article
Language:English
Subjects:
Configurations
Equations of motion
Kondo effect
Low temperature
Motion stability
Orbital stability
Quantum dots
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Summary:We investigate low-temperature spin and charge (orbital) Kondo effect of capacitively hierarchical equations of motion. In a charge stability diagram at finite interdot Coulomb repulsion, a line between triple points (LBTP) serves as the degeneracy of charge configuration states. With one electron difference on each dot, these charge configuration states can be regarded as pseudospins. It is shown that charge can also screen its counterpart through the high-order process using tunnelling-coupled reservoirs. In the charge configuration regime , in addition to the spin Kondo effect, the degeneracy and detuning of charge configuration states and may also cause a charge Kondo resonance that agrees with the experiments on triple-peak structures with differential conductance.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/132/67001