SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Statistical Physics: Far From Equilibrium I

DY 27.12: Vortrag

Mittwoch, 29. März 2023, 12:45–13:00, ZEU 250

Heat capacity for a driven array of semiclassical dots — •Pritha Dolai and Christian Maes — Instituut voor Theoretische Fysica, KU Leuven, Belgium

We analyze thermal properties for particle transport along an array of two-level systems. More specifically, we obtain analytic and numerical results for the heat capacity of a system of particles subject to mutual exclusion and to birth and death, driven around a ring by an external field. We find a zero-temperature phase transition as a function of the chemical potential of the environment, as shown by the divergence of the heat capacity at zero temperature. The non-vanishing of the heat capacity at absolute zero, violating the extended Third Law, is caused by a localization and corresponding delay in relaxation of excess heat. We also derive a regime of negative heat capacity indicating an anticorrelation between the temperature-dependence of the stationary occupation and the excess heat.