Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 52: Ultracold atoms, ions and BEC V (with A)
Q 52.3: Vortrag
Donnerstag, 20. März 2014, 17:00–17:15, BEBEL SR140/142
Non-equilibrium dynamics of ultra-cold atoms — •Fernando Gallego-Marcos1, Christian Nietner2, Gloria Platero1, and Tobias Brandes2 — 1Instituto de Ciencia de Materiales, CSIC, Cantoblanco, 28049 Madrid, Spain — 2Institut für Theoretische Physik, Technische Universität, 10623 Berlin, Germany
We study the dynamics between two ultra-cold atomic reservoirs, in the grand canonical ensemble, which initially have different temperatures and/or particle densities. These reservoirs are modeled as ideal quantum gases which are coupled to a quantum system with several discrete transition frequencies. We calculate the time dependent particle- and energy currents through the quantum system using a Born-Markov-Secular master equation approach in correspondance with Ref. [1]. Additionally, assuming a linear relation between the energy current and the change of the reservoir temperatures, we are able to model the equilibration of the reservoirs. Our numerically obtained results for fermionic particle transport are in accordance with recent experimental observations [2]. Moreover, we find a strong dependence of the equilibration on the energy structure of the quantum system. Consequently, we use a linear response approximation to analytically investigate this dependence in more detail.
References
[1] Nietner, C., Schaller, G., & Brandes, T. 2013, arXiv:1309.3488
[2] Brantut, J.-P., Grenier, C., Meineke, J., et al., Science 342, 713 (2013)