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Phys Rev Lett. 2004 May 14;92(19):196804. Epub 2004 May 13.

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

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Département de Physique and RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada.


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

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