Observation of Dynamical Super Efimovian Expansion in a Unitary Fermi Gas

Abstract

We report an observation of a dynamical super Efimovian expansion in a two-component strongly interacting Fermi gas by engineering time dependent external harmonic trap frequencies. When trap frequency is followed as $[1/4t^2+1/t^2\lambda \log (t/t_{\ast }){]}^{1/2}$, where $t_{\ast }$ and $\lambda$ are two control parameters, and the change is faster than a critical value, the expansion of such the quantum gas shows a novel dynamics due to its spatial and dynamical scaling symmetry. A clear double-log periodicity, which is a hallmark of the super Efimov effect, is emergent for the cloud size in the expansion. The universality of such scaling dynamics is verified both in the non-interacting limit and in the unitarity limit. Observing super-Efmovian evolution represents a paradigm in probing universal properties and allows in a new way to study many-body nonequilibrium dynamics with experiments.

arXiv comment5 pages+4 figures

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• Quantum Dynamics of Cold Atomic Gas with $SU(1,1)$ Symmetry
• Dimensional crossover for universal scaling far from equilibrium
• Magnetic Manifestation of Discrete Scaling Symmetry in Dirac Semimetals
• Scaling dynamics of the ultracold Bose gas