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

2023/06/28 by Stefan Lannig, Maximilian Prüfer, Lannig, Stefan +13 · 2 citations
Physics and Astronomy · Computer Science · #Cold Atom Physics and Bose-Einstein Condensates #Spectroscopy and Quantum Chemical Studies #Quantum Information and Cryptography

paper · pdf · doi:10.48550/arxiv.2306.16497

Abstract

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.

Cited by

• Adiabatic hydrodynamization and quasinormal modes of nonthermal attractors
• Decaying superfluid turbulence near an anomalous non-thermal fixed point

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