Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Quantum Gases: Bosons II
Q 22.1: Vortrag
Dienstag, 1. März 2016, 14:30–14:45, e001
Inducing Bose condensation with a hot needle — •Alexander Schnell1, Daniel Vorberg1, Roland Ketzmerick1,2, and André Eckardt1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany — 2Technische Universität Dresden, Institut für Theoretische Physik, 01187 Dresden, Germany
A quantum system exchanging energy with a thermal bath will assume an equilibrium state that is completely determined by the bath temperature. In contrast, when the system is driven out of equilibrium, e.g. by coupling it to two baths of different temperatures, the system will assume a non-equilibrium steady state that does not only depend on the bath temperatures, but on the very details of the system bath coupling.
This offers great freedom to tailor the properties of a system by bath engineering and can also give rise to counter intuitive effects. We consider an ideal one-dimensional Bose gas immersed in a cold bath. We show that the coherence length of the system can be increased by several orders of magnitude by coupling it additionally to a "hot needle" (a second, spatially localized bath that is much hotter than the first one). As a consequence, Bose condensation can be induced by a hot needle in a system of finite extent.