Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Quantum gases: Bosons II

Q 27.7: Vortrag

Dienstag, 18. März 2014, 15:30–15:45, UDL HS2002

Quench Dynamics near a Quantum Phase Transition in a Two-Component Bose Gas — •Markus Karl1,2, Aisling Johnson2,3, Eike Nicklas2,3, Markus Oberthaler2,3, and Thomas Gasenzer1,21Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany — 3Kirchhoff-Institute for Physics, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

We present a numerical analysis of the dynamics ensuing sudden quenches in a two-component, linear and non-linear coupled Bose gas. Starting from different initial configurations we study quenches in both, linear and non-linear, coupling parameters which end near, either below or above, the equilibrium quantum critical point. At the latter the equilibrium ground state changes from miscible to immiscible. Concentrating on the relative degrees of freedom which are represented in terms of spins, we discuss the time evolution of spin spectra and spin correlation lengths after the quench as a function of the distance to the critical point. We present numerical evidence that the non-equilibrium dynamical system is subject to self-similarity in time and space as a function of the distance to the equilibrium critical point, characterised by scaling exponents similar to the equilibrium phase transition. The presented results confirm recent experimental findings for a quasi-1D Rubidium-87 gas.

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