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

Abstract

We investigate the Fano-Kondo interplay in an Aharonov-Bohm ring with an embedded non-interacting 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 hybridisation of the non-interacting 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.

References in corpus (7)

• Orbital Kondo effect in carbon nanotubes
• The Kondo effect in C${}_{60}$ single-molecule transistors
• A benzene interference single-electron transistor
• Kondo and Dicke effect in quantum-dots side coupled to a quantum wire
• Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers
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• Designing a symmetry protected molecular device

Cited by in corpus (1)

• Manipulating quantum coherence of charge states in interacting double-dot Aharonov-Bohm interferometers