EFFECT OF DEPHASING ON MESOSCOPIC CONDUCTANCE FLUCTUATIONS IN QUANTUMDOTS WITH SINGLE-CHANNEL LEADS

We consider the distribution of conductance fluctuations in disordered quantum dots with single-channel leads. Using a perturbative diagramm atic approach, valid for continuous level spectra, we describe dephasi ng due to processes within the dot by considering two different contri butions to the level broadening, thus satisfying particle number conse rvation. Instead of a completely non-Gaussian distribution, which occu rs for zero dephasing, we find for strong dephasing that the distribut ion is mainly Gaussian with nonuniversal variance and non-Gaussian tai ls.