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DY: Fachverband Dynamik und Statistische Physik

DY 26: Poster II

DY 26.35: Poster

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

A full quantum-mechanical laser-model — •Gerald Waldherr and Günter Mahler — Institute of Theoretical Physics I, University of Stuttgart - Pfaffenwaldring 57, 70550 Stuttgart, Germany

We simulate an entirely quantum-mechanical laser-model comprised by a finite spin-network with one interfacing spin being coupled to a single field mode via Jaynes-Cummings-interaction.The spin-subsystem is intially prepared in a high energy state implying an effective negative temperature for the interfacing spin. The system evolves under pure Schrödinger-dynamics, but, nevertheless, shows relaxiation towards a state with increased field energy. The properties of the cavity-field are examined with quantum-optical methods (e.g. photon statistics).

Further investigations concern thermodynamical aspects of the system. The so called LEMBAS-scheme [1] is a method to systematically split energy exchange between a system and its environment into work and heat. We show that in the present case the energy exchange between both subsystems is heat only.

[1]H. Weimer et.al, Europhys. Lett., 83 (2008) 30008