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DY: Fachverband Dynamik und Statistische Physik

DY 26: Poster II

DY 26.37: Poster

Donnerstag, 26. März 2009, 16:00–18:00, P1A

Unstable spin networks: quantum thermodynamics with varying particle numbers — •Kilian Rambach and Günter Mahler — Universität Stuttgart, 1. Institut für Theoretische Physik, Stuttgart, Deutschland

Thermodynamic behavior of embedded quantum systems, e.g. relaxation, can be explained on entirely quantum mechanical grounds [1].

So far only systems under microcanonical and canonical conditions have been studied. We try to generalize this to grand canonical conditions. Here we restrict ourselves to a spin network. The respective environment allowing for particle exchange is introduced by means of additional "irrelevant" state spaces, to which the "relevant" state space (the spin) is connected via phenomenological transfer channels. One can thus study, e.g., the influence of effective particle number fluctuations as well as the quantum analogue to evaporative cooling.

[1] J. Gemmer, M. Michel, G. Mahler: Quantum thermodynamics, Springer (2004)