Low-temperature dephasing in disordered conductors: experimental aspects
نویسنده
چکیده
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 electron-phonon interaction in disordered conductors is also briefly discussed.
منابع مشابه
Decoherence in Disordered Conductors at Low Temperatures, the Effect of Soft Local Excitations
The conduction electrons’ dephasing rate, τ φ , is expected to vanish with the temperature. A very intriguing apparent saturation of this dephasing rate in several systems was recently reported at very low temperatures. The suggestion that this represents dephasing by zero-point fluctuations has generated both theoretical and experimental controversies. We start by proving that the dephasing ra...
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 کاملDephasing in Disordered Conductors due to Fluctuating Electric Fields
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 ...
متن کامل0 Energy Dependence of Phase Relaxation in a Disordered Fermi Liquid
A novel method is introduced to measure the phase-relaxation rate in disordered Fermi liquids. We deduce the dephasing rate from the magnitude of fluctuations in the local density of states, which are probed via resonant tunneling through a localized impurity state. While previous work focused on the temperature dependence of phase relaxation, we are able to determine the dephasing rate γφ of h...
متن کامل