Dephasing in Disordered Conductors due to Fluctuating Electric Fields
نویسندگان
چکیده
We develop a novel eikonal expansion for the Cooperon to study the effect of spaceand time-dependent electric fields on the dephasing rate of disordered conductors. For randomly fluctuating fields with arbitrary covariance we derive a general expression for the dephasing rate which is free of infrared divergencies in reduced dimensions. For time-dependent external fields with finite wavelength and sufficiently small amplitude we show that the dephasing rate is proportional to the square root of the electromagnetic power coupled into the system, in agreement with data by Wang and Lindelof [Phys. Rev. Lett. 59, 1156 (1987)]. PACS numbers: 72.15.Rn, 72.70.+m, 72.20.Ht, 73.23.-b Typeset using REVTEX
منابع مشابه
Low-temperature dephasing in disordered conductors: experimental aspects
Abstract. What is the lowest temperature to which one can trace the growth of the dephasing time τφ in low-dimensional conductors? I consider the fundamental limitation, the crossover from weak to strong localization, as well as several experimental reasons for frequently observed saturation of τφ (hot-electron effects, dephasing by external noise). Recent progress in our understanding of the e...
متن کاملInteraction and Quantum Decoherence in Disordered Conductors
Wepresent a nonperturbative approach which allows to evaluate the weak localization correction to the conductivity of disordered conductors in the presence of interactions. The effect of the electron-electron interaction on the magnetoconductance is described by the function A(t) exp(−f(t)). The dephasing time is determined only by f(t), and this time remains finite down to T = 0 due to the ele...
متن کاملDephasing In Coulomb Coupled Conductors
The charge fluctuations of two nearby mesoscopic conductors coupled only via the long range Coulomb force are discussed and used to find the dephasing rate which one conductor exerts on the other. The discussion is based on a formulation of the scattering approach for charge densities and the density response to a fluctuating potential. Coupling to the Poisson equation results in an electricall...
متن کاملPhase Relaxation of Electrons in Disordered Conductors
Conduction electrons in disordered metals and heavily doped semiconductors at low temperatures preserve their phase coherence for a long time: phase relaxation time τ ϕ can be orders of magnitude longer than the momentum relaxation time. The large difference in these time scales gives rise to well known effects of weak localization, such as anomalous magnetoresis-tance. Among other interesting ...
متن کاملM ar 1 99 8 Phase Relaxation of Electrons in Disordered Conductors
Conduction electrons in disordered metals and heavily doped semiconductors at low temperatures preserve their phase coherence for a long time: phase relaxation time τ ϕ can be orders of magnitude longer than the momentum relaxation time. The large difference in these time scales gives rise to well known effects of weak localization, such as anomalous magnetoresis-tance. Among other interesting ...
متن کامل