KIP publications

year 2024
author(s) Ido Siovitz, Stefan Lannig, Yannick Deller, Helmut Strobel, Markus K. Oberthaler, Thomas Gasenzer
title Universal dynamics of rogue waves in a quenched spinor Bose condensate
KIP-Nummer HD-KIP 24-42
KIP-Gruppe(n) F17,F20,F27
document type Paper
doi https://doi.org/10.1103/PhysRevLett.131.183402
Abstract (en)

Isolated many-body systems far from equilibrium may exhibit scaling dynamics with universal exponents indicating the proximity of the time-evolution to a non-thermal fixed point. We find universal dynamics connected with the occurrence of extreme wave excitations in the mutually coupled magnetic components of a spinor gas which propagate in an effectively random potential. The frequency of these rogue waves is affected by the time-varying spatial correlation length of the potential, giving rise to an additional exponent δc?1/3  for temporal scaling, which is different from the exponent βV?1/4 characterizing the scaling of the correlation length lVtβV in time. As a result of the caustics, i.e., focusing events, real-time instanton defects appear in the Larmor phase of the spin-1 system as vortices in space and time. The temporal correlations governing the instanton occurrence frequency scale as tδI. This suggests that the universality class of a non-thermal fixed point could be characterized by different, mutually related exponents defining the evolution in time and space, respectively. Our results have a strong relevance for understanding pattern coarsening from first principles and potential implications for dynamics ranging from the early universe to geophysical dynamics and micro physics.

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