Magnetic Field Dependent Kondo Transport through Double Quantum Dots System. Issue 4 (10th February 2022)

• Record Type: Journal Article
• Authors: Cheng, YongXi; Li, ZhenHua; Zheng, Xiao; Wei, JianHua; Luo, Hong‐Gang; Lin, Hai‐Qing; Yan, YiJing
• Is Part Of: Annalen der Physik. Volume 534:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-10
• Subjects: Kondo resonance -- parallel‐coupled double quantum dots -- singlet‐triplet transition -- thermoelectric transport; Physics -- Periodicals; Chemistry -- Periodicals; 530.05
• DOI: 10.1002/andp.202100439
• Languages: English
• ISSNs: 0003-3804

Abstract

Abstract: The Kondo transport associated with the magnetic field in parallel‐coupled double quantum dots (PDQDs) is theoretically investigated using the hierarchical‐equation‐of‐motion approach (HEOM). In this system, the interdot tunneling induces an effective antiferromagnetic interaction; thus, its ground state is an orbital singlet associated with approximately zero differential conductance. When an appropriate large magnetic field is applied, the two spins of the two dots have a possibility with a parallel arrangement, and thus the singlet and one of the triplets are degenerated. At the degenerate point, a distinct zero‐energy resonance peak appears, associated with significant differential conductance. The Kondo scale behavior at the degenerate point and the total and spin resolved spectral functions around the degenerate point are examined. The results confirm the spin‐1/2 Kondo resonance near the singlet‐triplet transition point. The differential conductance phase diagram, as well as thermoelectric transport, is also quantitatively presented. Abstract : The Kondo transport through the parallel‐coupled double‐quantum‐dots (PDQDs) is investigated. The Kondo resonance can be restored by the magnetic field at the singlet‐triplet transition point where the PDQDs are prepared in the orbital singlet. The spectral function and the scaling behavior of differential conductance demonstrate the spin‐1/2 Kondo effect. The related thermoelectric transport is also explored.