Universal non-thermal fixed point for quasi-1D Bose gases

Qi Liang; RuGway Wu; Pradyumna Paranjape; Ben Schittenkopf; Chen Li; Jörg Schmiedmayer; Sebastian Erne

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arXiv · 2505.20213

Universal non-thermal fixed point for quasi-1D Bose gases

Qi Liang·RuGway Wu·Pradyumna Paranjape·Ben Schittenkopf·Chen Li·Jörg Schmiedmayer·Sebastian Erne

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Abstract

Spatio-temporal scaling dynamics connected to non-thermal fixed points has been suggested as a universal framework to describe the relaxation of isolated far-from-equilibrium systems. Experimental studies in weakly-interacting cold atom systems have found scaling dynamics connected to specific attractors. In our experiments, we study a quantum gas of strongly interacting $^6$Li$_2$ Feshbach molecules, brought far out of equilibrium by imprinting a white-noise phase profile. The observed relaxation follows the same universal dynamics as for the previously observed formation of the order parameter in a shock-cooled gas of weakly interacting $^{87}$Rb atoms. Our results point to a single universal fixed point with a large basin of attraction governing the relaxation of quasi-1D bosonic systems, independent of their specific initial conditions and microscopic details.

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Qi Liang, RuGway Wu, Pradyumna Paranjape, Ben Schittenkopf, Chen Li, Jörg Schmiedmayer, Sebastian Erne. 2025-05-26. Universal non-thermal fixed point for quasi-1D Bose gases. https://arxiv.org/abs/2505.20213

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