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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.6: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Universal Dynamics in Bose Gases Far from Equilibrium — •Paul Große-Bley, Philipp Heinen, Christian-Marcel Schmied, and Thomas Gasenzer — Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

Far from equilibrium, comparatively little is known about the possibilities nature reserves for the structure and states of quantum many-body systems. Starting from a far-from equilibrium initial configuration a quantum many-body system can approach a non-thermal fixed point exhibiting universal scaling in time and space. Such fixed points have been discussed analytically as well as numerically and have recently been observed in experiments.

Different underlying physical configurations and processes can lead to the universal scaling characterizing the evolution at the fixed point. In particular, the dynamics can either be driven by the reconfiguration and annihilation of (topological) defects populating the system or by conserved redistribution of quasiparticle excitations. We introduce far from equilibrium initial configurations that feature different physical configurations by means of parameter quenches.

In our work we numerically analyze Bose gases in up to three spatial dimensions using the semi-classical truncated Wigner method. We calculate correlation functions in order to extract universal properties of the system. To unravel the underlying physics characterizing the evolution of systems at the non-thermal fixed point we specifically investigate phase correlations and higher order field correlations.