Regensburg 2000 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 9: Mesoskopische Systeme
TT 9.9: Vortrag
Dienstag, 28. März 2000, 12:30–12:45, H18
Real-time renormalization group: Charge fluctuations in metallic islands and quantum dots — •Herbert Schoeller1, Jürgen König2, Frank Kuczera3, and Gerd Schön3 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany — 2Department of Physics, Indiana University, Bloomington, Indiana 47405, USA — 3Institut für theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
We develop a perturbative renormalization-group method in real time to describe nonequilibrium properties of discrete quantum systems coupled linearly to an environment. We include energy broadening and dissipation and develop a cutoff-independent formalism. We apply the method to charge fluctuations in single-electron devices at low temperatures. We present quantitatively reliable results for the conductance in metallic islands and in the mixed-valence and empty-orbital regime of the nonequilibrium Anderson impurity model. We consider a finite charging energy and include all charge states.