SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.17: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Effective Model of Phase Excitations in a 1D Spin-1 BEC Far from Equilibrium — Ido Siovitz, •Hannes Köper, Aleksandr Mikheev, Philipp Heinen, Stefan Lannig, Yannick Deller, Helmut Strobel, Markus Oberthaler, and Thomas Gasenzer — Kirchhof Institut für Physik, Universität Heidelberg, Heidelberg, Deutschland

The spin-1 Bose gas quenched far from equilibrium to the easy-plane shows a plethora of interesting phenomena, of which we discuss the universal spatio-temporal self-similar scaling on account of the system's vicinity to an hypothesized non-thermal fixed point. The appearance of topological excitations, such as instantons, in the transversal spin degree of freedom during the equilibration process of the condensate leads to a varying length scale, reflecting the self-similar scaling of correlations. Due to the multitude of degrees of freedom in the spin-1 BEC, the causes of the system's behavior far from equilibrium are difficult to investigate.

We present a low-energy effective field theory to describe the dynamics of the system and find the driving mechanism behind the production of such topological objects in the system. We show that the effective model presents the same self similar scaling behavior of the full spin-1 Bose gas quenched to the easy-plane phase.