Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.12: Poster

Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer

Low-Energy Effective Field Theory for a Spin-1 BEC Far From Equilibrium — •Anna-Maria Elisabeth Glück, Ido Siovitz, Hannes Köper, and Thomas Gasenzer — Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

The spin-1 Bose gas quenched far from equilibrium displays remarkable universal spatio-temporal self-similar scaling, which we hypothesize to be due to the system's vicinity to a non-thermal fixed point during its evolution back to equilibrium. This study introduces a low-energy effective field theory for the description of the phase-excitation dynamics in a one-dimensional spin-1 Bose gas following a quench from the polar to the easy-plane phase. In particular, we explore the incorporation of density fluctuations beyond the 1-loop order. Through numerical simulations, we subsequently compare the far-from-equilibrium scaling behavior of the effective theory to that of the fundamental theory.

Keywords: Far-from-equilibrium quantum dynamics; Universality; Non-thermal fixed points