Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Statistical Physics II (General)

DY 25.2: Talk

Tuesday, March 13, 2018, 10:15–10:30, BH-N 243

THE CONCEPT OF TEMPERATURE IN OPEN QUANTUM SYSTEMS: A MICRO-CANONICAL APPROACH — •Camilo Alfonso Moreno Jaimes and Juan Diego Urbina — Institute für Theoretische Physik, Universität Regensburg, Germany

We aim to investigate the concept of temperature in the Open Quantum System (system+reservoir) approach staring from a microcanonical bath scenario where the temperature is not a fundamental but a derived auxiliary concept. When the usual weak coupling regime is assumed, it is well known that the temperature emerges as an effective function of the energy from the saddle-point analysis that justifies the classic ensemble equivalence in the thermodynamic limit[1]. In the strong coupling regime, however, the energy is no longer an extensive quantity and we need a redefinition of temperature. We develop a microscopic analysis based on the Feynmann-Vernon approach to investigate the emergence and meaning of temperature in this strong coupling regime.

[1]: G. Horwitz. Commun. Math. Phys. 89, 11%129 (1983).