Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers

Abstract

We study two quantum dots embedded in the arms of an Aharonov-Bohm ring threaded by a magnetic flux. The system can be described by an effective one-impurity Anderson model with an energy- and flux-dependent density of states. For specific values of the flux, this density of states vanishes at the Fermi energy, yielding a controlled realization of the pseudogap Kondo effect. The conductance and transmission phase shifts reflect a nontrivial interplay between wave interference and interactions, providing clear signatures of quantum phase transitions between Kondo and non-Kondo ground states.

Published version

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Cited by in corpus (17)

• Suppression of Kondo screening by the Dicke effect in multiple quantum dots
• Engineering the Kondo and Fano effects in double quantum dots
• Inducing spin-correlations and entanglement in a double quantum dot through non-equilibrium transport
• Tunable Quantum Phase Transitions in a Resonant Level Coupled to Two Dissipative Baths
• Signatures of quantum phase transitions in parallel quantum dots: Crossover from local-moment to underscreened spin-1 Kondo physics
• Quantum phase transitions in a pseudogap Anderson-Holstein model
• Validity of the local self-energy approximation: Application to coupled quantum impurities
• Spin-dependent transport through quantum-dot Aharonov-Bohm interferometers
• Electrical and thermoelectrical transport in Dirac fermions through a quantum dot
• Interaction effects in Aharonov-Bohm-Kondo Rings
• Fano-Kondo resonance versus Kondo plateau in an Aharonov-Bohm ring with an embedded quantum dot
• Magnetic flux tuning of Fano-Kondo interplay in a parallel double quantum dot system
• Quantum criticality out of equilibrium in the pseudogap Kondo model
• Coulomb-modified Fano interference in a double quantum dot Aharonov-Bohm ring
• Quantum impurity with 2/3 local moment in 1D quantum wires: an NRG study
• Dissipation- versus Chaos-Induced Relaxation in Non-Markovian Quantum Many-Body Systems
• Kondo effect in a side-coupled double-quantum-dot system embedded in a mesoscopic ring