Please use this identifier to cite or link to this item:
Title: Nonlinear effects and dephasing in disordered electron systems
Authors: Raimondi, Roberto
Schwab, Peter
Castellani, Claudio
Keywords: dephasing
disordered elecron systems
quantum interaction corrections
non-linear effects
weak localization
Issue Date: 1999
Publisher: American Physical Society
Source: 33
Abstract: The calculation of the dephasing time in electron systems is presented. By means of the Keldysh formalism, we discuss in a unifying way both weak localization and interaction effects in disordered systems. This allows us to show how dephasing arises both in the particle-particle channel (weak localization) and in the particle-hole channel (interaction effect). First we discuss dephasing by an external field. Besides reviewing previous work on how an external oscillating field suppresses the weak localization correction, we derive a new expression for the effect of a field on the interaction correction. We find that the latter may be suppressed by a static electric field, in contrast to weak localization. We then consider dephasing due to inelastic scattering. The ambiguities involved in the definition of the dephasing time are clarified by directly comparing the diagrammatic approach with the path-integral approach. We show that different dephasing times appear in the particle-particle and particle-hole channels. Finally we comment on recent experiments.
ISSN: 1550-235x
DOI: 10.1103/PhysRevB.60.5818
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

Files in This Item:
File Description SizeFormat Existing users please Login
9903146v1.pdf315.81 kBAdobe PDF    Request a copy
Show full item record Recommend this item

Page view(s)

Last Week
Last month
checked on Dec 6, 2023


checked on Dec 6, 2023

Google ScholarTM




Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.