Coulomb blockade of a noisy metallic box: A realization of Bose-Fermi Kondo models

Abstract

We focus on a metallic quantum dot coupled to a reservoir of electrons through a single-mode quantum point contact and capacitively connected to a back-gate, by taking into account that the gate voltage can exhibit noise; This will occur when connecting the gate lead to an external transmission line with a finite Ohmic resistance. The voltage (charge) fluctuations at the back gate can be described through a Caldeira-Leggett model of harmonic oscillators. For weak tunneling between the lead qnd the dot, exploiting the anisotropic Bose-Fermi Kondo model, we show that zero-point fluctuations of the environment can markedly alter the previous Matveev Kondo fixed point leading to an amplification of the Coulomb blockade phenomenon.

4 pages and 2 figures (fig 2 more explicit and changes in text on page 2)

References in corpus (1)

• Quantum phase transitions in the Bose-Fermi Kondo model

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