Exponential sensitivity to dephasing of electrical conduction through a quantum dot

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dc.creatorTworzydlo, J.
dc.creatorTajic, A.
dc.creatorSchomerus, H.
dc.creatorBrouwer, P. W.
dc.creatorBeenakker, C. W. J.
dc.date2004-07-20
dc.date.accessioned2026-07-07T02:59:18Z
dc.date.available2026-07-07T02:59:18Z
dc.descriptionAccording to random-matrix theory, interference effects in the conductance of a ballistic chaotic quantum dot should vanish $\propto(τ_ϕ/τ_{D})^{p}$ when the dephasing time $τ_ϕ$ becomes small compared to the mean dwell time $τ_{D}$. Aleiner and Larkin have predicted that the power law crosses over to an exponential suppression $\propto\exp(-τ_{E}/τ_ϕ)$ when $τ_ϕ$ drops below the Ehrenfest time $τ_{E}$. We report the first observation of this crossover in a computer simulation of universal conductance fluctuations. Their theory also predicts an exponential suppression $\propto\exp(-τ_{E}/τ_{D})$ in the absence of dephasing -- which is not observed. We show that the effective random-matrix theory proposed previously for quantum dots without dephasing explains both observations.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0407526
dc.identifierhttp://arxiv.org/abs/cond-mat/0407526
dc.identifierPhysical Review Letters 93, 186806 (2004)
dc.identifierdoi:10.1103/PhysRevLett.93.186806
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24457
dc.subjectMesoscale and Nanoscale Physics
dc.titleExponential sensitivity to dephasing of electrical conduction through a quantum dot
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