Stabilizing an ultracold Fermi gas against Fermi acceleration to superdiffusion through localization

• URL: http://arxiv.org/abs/2311.08224v3
• Date: Tue, 14 May 2024 09:59:45 GMT
• Title: Stabilizing an ultracold Fermi gas against Fermi acceleration to superdiffusion through localization
• Authors: Sian Barbosa, Maximilian Kiefer-Emmanouilidis, Felix Lang, Jennifer Koch, Artur Widera,
• Abstract summary: Anderson localization, i.e., destructive quantum interference of multiple-scattering paths, halts transport entirely. Time-dependent random forces expedite transport via Fermi acceleration, proposed as a mechanism for high-energy cosmic rays. Our system enables the investigation of Fermi acceleration in the quantum-transport regime.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Anderson localization, i.e., destructive quantum interference of multiple-scattering paths, halts transport entirely. Contrarily, time-dependent random forces expedite transport via Fermi acceleration, proposed as a mechanism for high-energy cosmic rays. Their competition creates interesting dynamics, but experimental observations are scarce. Here, we experimentally study the expansion of an ultracold Fermi gas inside time-dependent disorder and observe distinct regimes from sub- to superdiffusion. Unexpectedly, quantum interference counteracts acceleration in strong disorder. Our system enables the investigation of Fermi acceleration in the quantum-transport regime.

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