Stabilizing an ultracold Fermi gas against Fermi acceleration to superdiffusion through localization
arXiv:2311.08224 · doi:10.1103/rq4w-377l
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.
Main: 7 pages, 3 figures; Supp. Mat.: 4 pages, 2 figures
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