Volume 132, Number 6, December 2020
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||28 December 2020|
Spin and charge Kondo effects in capacitively coupled double quantum dots
Department of Physics & Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-nano Devices, Renmin University of China - Beijing 100872, China
Received: 2 December 2019
Accepted: 18 June 2020
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 $[1,1]$ , in addition to the spin Kondo effect, the degeneracy and detuning of charge configuration states $|2,0\rangle/|1,1\rangle$ and $|1,1\rangle/|0,2\rangle$ may also cause a charge Kondo resonance that agrees with the experiments on triple-peak structures with differential conductance.
PACS: 72.15.Qm – Scattering mechanisms and Kondo effect / 73.63.Kv – Quantum dots / 73.63.-b – Electronic transport in nanoscale materials and structures
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