[en] Dephasing in open quantum chaotic systems has been investigated in the limit of large system sizes to the Fermi wavelength ratio, L/lambda F >> 1. The weak localization correction g(wl) to the conductance for a quantum dot coupled to (i) an external closed dot and (ii) a dephasing voltage probe is calculated in the semiclassical approximation. In addition to the universal algebraic suppression g wl proportional to (1 + tau(D)/tau(phi))(-1) with the dwell time tau(D) through the cavity and the dephasing rate, we find an exponential suppression of weak localization by a factor of proportional to exp[-(tau) over tilde/tau(phi)], where is the system-dependent parameter. In the dephasing probe model, (tau) over tilde coincides with the Ehrenfest time, (tau) over tilde proportional to ln[L/lambda(F)], for both perfectly and partially transparent dot-lead couplings. In contrast, when dephasing occurs due to the coupling to an external dot, (tau) over tilde proportional to ln[L/xi] depends on the correlation length xi of the coupling potential instead of lambda(F).
Disciplines :
Physics
Author, co-author :
Petitjean, Cyril ; Université de Liège - ULiège > Département de physique > Physique quantique statistique
Jacquod, P.; Univ Arizona, Dept Phys, Tucson, AZ 85721 USA.
Whitney, R. S.; Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France.
Language :
English
Title :
Dephasing in the semiclassical limit is system-dependent
Publication date :
2007
Journal title :
JETP Letters
ISSN :
0021-3640
eISSN :
1090-6487
Publisher :
Maik Nauka/Interperiodica/Springer, New York, United States - New York
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