Coulomb blockade and Non-Fermi-liquid behavior in quantum dots

Abstract

The non-Fermi-liquid properties of an ultrasmall quantum dot coupled to a lead and to a quantum box are investigated. Tuning the ratio of the tunneling amplitudes to the lead and box, we find a line of two-channel Kondo fixed points for arbitrary Coulomb repulsion on the dot, governing the transition between two distinct Fermi-liquid regimes. The Fermi liquids are characterized by different values of the conductance. For an asymmetric dot, spin and charge degrees of freedom are entangled: a continuous transition from a spin to a charge two-channel Kondo effect evolves. The crossover temperature to the two-channel Kondo effect is greatly enhanced away from the local-moment regime, making this exotic effect accessible in realistic quantum-dot devices.

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References in corpus (8)

• Coulomb blockade at almost perfect transmission
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• Strong Tunneling in the Single-Electron Box
• Solution of the Two-Channel Anderson Impurity Model - Implications for the Heavy Fermion UBe${}_{13}$ -
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• Renormalization Group Approach to Spectral Properties of the Two-Channel Anderson Impurity Model
• SO(5) non-Fermi liquid in a Coulomb box device
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• Dynamical correlations in the spin-half two-channel Kondo model
• SO(5) critical point in a spin-flavor Kondo device -- Bosonization and refermionization solution
• BCS surrogate models for floating superconductor-semiconductor hybrids
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