Dresden 2014 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 40: Poster - Quantum Systems/ Stat. Phys./ Diffusive Process
DY 40.19: Poster
Thursday, April 3, 2014, 17:00–19:00, P3
Generalized Bose condensation into multiple states and heat transport in tight-binding lattices far from equilibrium — •Alexander Schnell1,2, Daniel Vorberg1,2, Waltraut Wustmann1,2, Roland Ketzmerick1,2, and André Eckardt1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany — 2Technische Universität Dresden, Institut für Theoretische Physik, 01062 Dresden, Germany
If an ideal Bose gas is driven into a steady state far from equilibrium, then a generalized form of Bose condensation can occur [1]. Namely the single-particle states unambiguously separate into two groups: one, that we call Bose selected, whose occupations increase linearly when the total particle number is increased at fixed system size, and another one whose occupations saturate. We study this effect in a tight-binding lattice, where the non-equilibrium regime is achieved either by coupling the system to two heat baths, one of positive and another one of negative temperature, or by a combination of periodic forcing and the coupling to a heat bath. We investigate which and how many single-particle states are selected in such lattice systems. We, moreover, address how system properties like the heat conductivity are controlled by the various parameters of the model, like lattice size, dimensionality, or the coupling to the heat bath(s).
[1] D. Vorberg, W. Wustmann, R. Ketzmerick and A. Eckardt, Phys.
Rev. Lett. (to be published), arXiv:1308.2776