Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Quantum Dynamics, Decoherence and Quantum Information (organized by DY)
TT 12.6: Vortrag
Montag, 31. März 2014, 11:15–11:30, HÜL 186
Dissipative dynamics and energy transfer of a harmonic oscillator coupled to nonthermal baths — •Daniel Pagel1, Andreas Alvermann1, Holger Fehske1, Peter Nalbach2, and Michael Thorwart2 — 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald — 2I. Institut für Theoretische Physik, Universität Hamburg
The dissipative dynamics of a quantum-mechanical system can be studied in a microscopic setting if one includes an explicit coupling to one or more baths of harmonic oscillators. Allowing for general nonequilibrium bath preparations instead of the usually employed thermal ones, we look at the long-time behavior of the dissipative harmonic oscillator coupled to one bath and prove that it equilibrates in the absence of isolated modes. The stationary density matrix in the long-time limit then depends on the initial bath state only. We discuss the requirements for full thermalization of the central oscillator. In the case of multiple baths, where stationary nonequilibrium states of the central oscillator become possible, we show that the fluctuations of the central oscillator follow an exact generalized nonequilibrium fluctuation relation. Finally, we discuss the generalization of the cumulant generating function for the energy transfer through the oscillator to the nonthermal situation.