Quantum criticality in a double quantum-dot system

Abstract

We discuss the realization of the quantum-critical non-Fermi liquid state, originally discovered within the two-impurity Kondo model, in double quantum-dot systems. Contrary to the common belief, the corresponding fixed point is robust against particle-hole and various other asymmetries, and is only unstable to charge transfer between the two dots. We propose an experimental set-up where such charge transfer processes are suppressed, allowing a controlled approach to the quantum critical state. We also discuss transport and scaling properties in the vicinity of the critical point.

4 pages, 3 figs; (v2) final version as published

References in corpus (3)

• Orbital Kondo effect in carbon nanotubes
• Transport spectroscopy of Kondo quantum dots coupled by RKKY interaction
• Dissipation-induced quantum phase transition in a quantum box

Cited by in corpus (13)

• The numerical renormalization group method for quantum impurity systems
• Quantum phase transition in a single-molecule quantum dot
• Numerical renormalization group study of two-channel three-impurity triangular clusters
• Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots
• Two-stage Kondo effect in side-coupled quantum dots: Renormalized perturbative scaling theory and Numerical Renormalization Group analysis
• Finite-temperature conductance signatures of quantum criticality in double quantum dots
• Dynamical conductance in the two-channel Kondo regime of a double dot system
• Two-Channel Kondo Effects in Al/AlO${}_x$/Sc Planar Tunnel Junctions
• Transconductance of a double quantum dot system in the Kondo regime
• Time-dependent magnetotransport of a wave packet in a quantum wire with embedded quantum dots
• The Two-Impurity Anderson Model at Quantum Criticality
• The two-impurity Kondo model with spin-orbit interactions
• Boundary quantum criticality in models of magnetic impurities coupled to bosonic baths