Experimentally accessible drive-induced attractor in a Fermi gas near unitarity

Michal P. Heller; Clemens Werthmann

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arXiv · 2507.02838

Experimentally accessible drive-induced attractor in a Fermi gas near unitarity

Michal P. Heller·Clemens Werthmann

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Abstract

Hydrodynamic attractors describe loss of sensitivity to initial conditions. Their earliest, expansion-driven stage is distinct from the later relaxation-driven mechanism and central to the theoretical paradigm but hard to access in heavy-ion collision experiments. We show within a coupled energy-bulk-pressure model that a near-unitary Fermi gas driven by a rapid scattering-length sweep loses sensitivity to one state-space direction before bulk relaxation sets in -- visible only in the joint state space, not as a universal single-variable curve. We outline an experimental $^{40}$K protocol based on time-resolved contact measurements and a varied-ramp comparison.

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Michal P. Heller, Clemens Werthmann. 2025-07-03. Experimentally accessible drive-induced attractor in a Fermi gas near unitarity. https://arxiv.org/abs/2507.02838

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