Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.14: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Crossover from Non-equilibrium to Equilibrium Behavior in the Time–DependentKondo Model — •Stefan Kehrein and Dmitry Lobaskin — Insitut für Physik – Elektronische Korrelationen und Magnetismus, Universität Augsburg

We investigate the equilibration of a Kondo model that is initially prepared in a non–equilibrium state towards its equilibrium behavior for large times. Such initial non–equilibrium states can e.g. be realized in quantum dot experiments with time–dependent gate voltages or in rf SQUIDS. We evaluate the spin–spin correlation function at the Toulouse point of the Kondo model exactly and show that there is a smooth crossover between non–equilibrium and equilibrium behavior as the non–equilibrium initial state decays as a function of the waiting time. In particular, we demonstrate that the decaying non–equilibrium state cannot be thought of as an equilibrium state with an effective temperature that depends on the waiting time.