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Письма в Журнал экспериментальной и теоретической физики, 2007, том 86, выпуск 10, страницы 736–740
(Mi jetpl917)
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Эта публикация цитируется в 9 научных статьях (всего в 9 статьях)
КОНДЕНСИРОВАННЫЕ СРЕДЫ
Dephasing in the semiclassical limit is system–dependent
C. Petitjeana, P. Jacquodb, R. S. Whitneyc a Département de Physique Théorique, Université de Genève
b Physics Department, University of Arizona, Tucson, AZ 85721, USA
c Institut Laue-Langevin, 38042 Grenoble, France
Аннотация:
We investigate dephasing in open quantum chaotic systems in the limit of large system size to Fermi wavelength ratio, $L/\lambda_\mathrm F\gg1$. We semiclassically calculate the weak localization correction $g^\mathrm{wl}$ to the conductance for a quantum dot coupled to (i) an external closed dot and (ii) a dephasing voltage probe. In addition to the universal algebraic suppression $g^\mathrm{wl}\propto (1+\tau_\mathrm{ D}/\tau_\phi)^{-1}$ with the dwell time $\tau_\mathrm D$ through the cavity and the dephasing rate $\tau_\phi^{-1}$, we find an exponential suppression of weak localization by a factor $\propto\exp[-\tilde\tau/\tau_\phi]$, with a system-dependent $\tilde\tau$. In the dephasing probe model, $\tilde\tau$ coincides with the Ehrenfest time, $\tilde\tau\propto\ln [L/\lambda_\mathrm F]$, for both perfectly and partially transparent dot-lead couplings. In contrast, when dephasing occurs due to the coupling to an external dot, $\tilde\tau\propto\ln [L/\xi]$ depends on the correlation length $\xi$ of the coupling potential instead of $\lambda_\mathrm F$.
Поступила в редакцию: 08.10.2007
Образец цитирования:
C. Petitjean, P. Jacquod, R. S. Whitney, “Dephasing in the semiclassical limit is system–dependent”, Письма в ЖЭТФ, 86:10 (2007), 736–740; JETP Letters, 86:10 (2007), 647–651
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl917 https://www.mathnet.ru/rus/jetpl/v86/i10/p736
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