Abstract
We develop a perturbative renormalization-group method in realtime to describe nonequilibrium properties of discrete quantumsystems coupled linearly to an environment. We include energybroadening and dissipation and develop a cutoff-independentformalism. We apply the method to charge fluctuations insingle-electron devices at low temperatures. We presentquantitatively reliable results for the conductance inmetallic islands and in the mixed-valence and empty-orbitalregime of the nonequilibrium Anderson impurity model. Weconsider a finite charging energy and include all chargestates.
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