Dissipative quantum phase transition in a quantum dot

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dc.creatorBorda, L.
dc.creatorZarand, G.
dc.creatorGoldhaber-Gordon, D.
dc.date2006-02-01
dc.date2006-02-14
dc.date.accessioned2026-07-07T07:01:25Z
dc.date.available2026-07-07T07:01:25Z
dc.descriptionWe study the transport properties of a quantum dot (QD) with highly resistive gate electrodes, and show that the QD displays a quantum phase transition analogous to the famous dissipative phase transition first identified by S. Chakravarty [Phys. Rev. Lett. {\bf 49}, 681 (1982)]; for a review see [A. J. Leggett {\em et al.}, Rev. Mod. Phys. {\bf 59}, 1 (1987)]. At temperature T=0, the charge on the central island of a conventional QD changes smoothly as a function of gate voltage, due to quantum fluctuations. However, for sufficiently large gate resistance charge fluctuations on the island can freeze out even at the degeneracy point, causing the charge on the island to change in sharp steps as a function of gate voltage. For $R_g<R_C$ the steps remain smeared out by quantum fluctuations. The Coulomb blockade peaks in conductance display anomalous scaling at intermediate temperatures, and at very low temperatures a sharp step develops in the QD conductance.
dc.description4+ pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0602019
dc.identifierhttp://arxiv.org/abs/cond-mat/0602019
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108265
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleDissipative quantum phase transition in a quantum dot
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