Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.35: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Quench-condensation of one-dimensional Bose gases — •Sebastian Erne1,2,4, Thomas Gasenzer1,2,3, and Jörg Schmiedmayer41Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany — 3Kirchhoff-Institut für Physik, INF 227, 69120 Heidelberg, Germany — 4Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, TU Wien, Vienna, Austria

This work investigates the rapid cooling quench over the dimensional- and quasicondensate-crossover. Following experiments performed by R. Bücker, W. Rohringer et.al at the Atominstitut in Vienna, we study the relaxation of such a far-from equilibrium system. The early stage of condensate formation is dominated by solitonic excitations. The high density of these defects lead to a characteristic exponential momentum distribution as well as stability of the condensate towards exterior pertubations. Experimental and numerical results are compared to analytical predictions drawn from our model of randomly distributed defects. Complete thermalization of the system is observed through measurements of the momentum distribution, exhibiting a transition from the random defect to a modifed Yang-Yang model.

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