Observation of two non-thermal fixed points for the same microscopic symmetry

Close to equilibrium, the underlying symmetries of a system determine its possible universal behavior. Far from equilibrium, however, different universal phenomena associated with the existence of multiple non-thermal fixed points can be realized for given microscopic symmetries. Here, we study this...

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Main Authors Lannig, Stefan, Prüfer, Maximilian, Deller, Yannick, Siovitz, Ido, Dreher, Jan, Gasenzer, Thomas, Strobel, Helmut, Oberthaler, Markus K
Format Journal Article
LanguageEnglish
Published 28.06.2023
Subjects
Physics - Quantum Gases
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Summary:Close to equilibrium, the underlying symmetries of a system determine its possible universal behavior. Far from equilibrium, however, different universal phenomena associated with the existence of multiple non-thermal fixed points can be realized for given microscopic symmetries. Here, we study this phenomenon using a quasi-one-dimensional spinor Bose-Einstein condensate. We prepare two different initial conditions and observe two distinct universal scaling dynamics with different exponents. Measurements of the complex-valued order parameter with spatial resolution allow us to characterize the phase-amplitude excitations for the two scenarios. Our study provides new insights into the phenomenon of universal dynamics far from equilibrium and opens a path towards mapping out the associated basins of non-thermal fixed points.
DOI:10.48550/arxiv.2306.16497