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

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

2003-11-21

arxiv.org/abs/cond-mat/0311502v2

Phys. Rev. B 70, 201306(R) (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures

Scientific paper

10.1103/PhysRevB.70.201306

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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