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

2025/07/03 by Michal P. Heller, Clemens Werthmann, Heller, Michal P. +1 · 4 citations
Physics and Astronomy · #hep-th #cond-mat.quant-gas #hep-ph #nucl-th

paper · pdf · doi:10.48550/arxiv.2507.02838

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 ⁴⁰K protocol based on time-resolved contact measurements and a varied-ramp comparison.

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• Close encounters with attractors of the third kind
• Attractor of hydrodynamic attractors
• Few is different: deciphering many-body dynamics in mesoscopic quantum gases
• Far from equilibrium attractors in phase space

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