Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum gases: Bosons, mixtures and spinor gases
Q 12.3: Vortrag
Montag, 17. März 2014, 14:30–14:45, UDL HS2002
Quench dynamics and non-thermal fixed points in a spin-1 spinor Bose-Einstein condensates — •Sebastian Heupts1,2, Markus Karl1,2, and Thomas Gasenzer1,2 — 1Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
We present a numerical analysis of nonequilibrium dynamics in spin-1 ferromagnetic and antiferromagnetic spinor Bose-Einstein condensates using classical field equations in a statistical approach. The system is driven away from equilibrium by classically unstable initial conditions, resulting in the emergence of topological defects such as spin textures, magnetic domains and domain walls, and spin vortices. This is equivalent to rapid quenches through a second order quantum phase transition, which can be done very well experimentally. We study the time evolution of the system and the excitation spectrum in the context of turbulent scaling properties. The results can be interpreted in terms of nonthermal fixed points and give rise to the possibility to study spin turbulence in experiment without the necessity of detecting topological defects in situ.