Orbital Kondo effect in a parallel double quantum dot

Abstract

We construct a theoretical model to study the orbital Kondo effect in a parallel double quantum dot (DQD). Recently, pseudospin-resolved transport spectroscopy of the orbital Kondo effect in a DQD has been experimentally reported. The experiment revealed that when interdot tunneling is ignored, there exist two and one Kondo peaks in the conductance-bias curve for the pseudospin-non-resolved and pseudospin-resolved cases, respectively. Our theoretical studies reproduce this experimental result. We also investigate the situation of all lead voltages being non-equal (the complete pseudospin-resolved case), and find that there are four Kondo peaks at most in the curve of the conductance versus the pseudospin splitting energy. When the interdot tunneling is introduced, some new Kondo peaks and dips can emerge. Besides, the pseudospin transport and the pseudospin flipping current are also studied in the DQD system. Since the pseudospin transport is much easier to be controlled and measured than the real spin transport, it can be used to study the physical phenomenon related to the spin transport.

18 pages, 7 figures, accepted by J. Phys.: Condens. Matter in September 2014

References in corpus (11)

• Orbital Kondo effect in carbon nanotubes
• Observation of the SU(4) Kondo state in a double quantum dot
• Evolution of SU(4) Transport Regimes in Carbon Nanotube Quantum Dots
• Correlated electron tunneling through two separate quantum dot systems with strong capacitive interdot coupling
• Pseudospin-Resolved Transport Spectroscopy of the Kondo Effect in a Double Quantum Dot
• Orbital Kondo spectroscopy in a double quantum dot system
• Realization of SU(N) Kondo effect in strong magnetic field
• Full electrostatic control over polarized currents through spin-orbital Kondo effect
• Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot
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Cited by in corpus (7)

• Correlated Coulomb drag in capacitively coupled quantum-dot structures
• Conditions for observing emergent SU(4) symmetry in a double quantum dot
• Fluctuation-driven Coulomb drag in interacting quantum dot systems
• Nonequilibirum noise spectrum and Coulomb-blockade-assisted Rabi interference in a double-dot Aharonov-Bohm interferometer
• Kondo behavior and conductance through $3d$ impurities in gold chains doped with oxygen
• Charge-Kondo effect mediated by repulsive interactions
• Performance of the T-matrix based master equation for Coulomb drag in double quantum dots