Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.60: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

General relation between diffusive transport and current-autocorrelation function — •Jochen Gemmer — Universität Osnabrück, Osnabrueck, Germany

The (regular) conductivity relates a current to an external force field. Within linear response theory this coductivity is given by the Kubo formula, i.e., essentially the current-autocorrelation function. The diffusion constant relates a current to a spatial density gradient. We investigate from first principles if and in which sense the diffusion constant can also be calculated from the current-autocorrelation function. In other words, we aim at verifying a generalized Einstein relation on basic quantum mechanical grounds.