Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Statistical Physics (General) I

DY 17.3: Vortrag

Dienstag, 2. April 2019, 10:30–10:45, H19

Effective temperatures in equilibrium: ring statistics in 2D-silica — Projesh Kumar Roy and •Andreas Heuer — Institut f. Phys. Chemie, WWU Münster

The thermodynamic properties of subsystems in strong interaction with the neighborhood can largely differ from the standard behavior. For example the energy distribution of a harmonic dumbbell in a solvent can be described as if it would experience a broad distribution of temperatures, albeit with the correct average temperature [1]. Here we analyse for the case of 2D-silica [2] the energy distribution for rings of a given size via computer simulations [3]. It turns out that the observed energy distribution of also displays non-standard behavior. However, the observed energy distribution is related to a single strongly reduced temperature as compared to the temperature of the heat bath. This effective temperature approaches the temperature of the heat bath for larger ring sizes. From a systematic analysis of the 1D Ising model and an analytically solvable model we suggest that these observations reflect the presence of strong local energy correlations [4].

[1] P.D. Dixit, Phys. Chem. Chem. Phys.17, 13000 (2015).

[2] L. Lichtenstein, M. Heyde, and H.-J. Freund, J. Phys. Chem. C 116, 20426 (2012).

[3] P. K. Roy, M. Heyde, and A. Heuer, Phys. Chem. Chem. Phys. 20, 14725 (2018).

[4] P. K. Roy, A. Heuer, arXiv:1808.03869; Phys. Rev. Lett. (accepted)