SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Gases: Fermions I

Q 50.4: Vortrag

Donnerstag, 9. März 2023, 11:45–12:00, F342

Tunable diffusion properties of spin-polarized Fermi gases in time-dependent disorder — •Sian Barbosa, Max Kiefer-Emmanouilidis, Felix Lang, Jennifer Koch, Michael Fleischhauer, and Artur Widera — Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, Germany

The transport of particles through disordered potential landscapes has been actively studied for the last decades. The vast majority of these studies, e.g. of Anderson localization, addressed the regime in which the disordered potential is static. However, it seems natural to investigate the influence of time-dependent disorder on transport properties. More specifically, a crossover from localization to diffusive, even hyper-ballistic, transport is expected to occur when the disorder varies in time. I will present the results of our experimental investigation of the dynamics of ultracold, spin-polarized fermionic lithium atoms when exposed to an optical speckle potential that can be frozen or continuously varying its random pattern in both space and time. We observe a strong dependence of the system's diffusion exponent on the so-called correlation time, a measure for the disorder's rate of change. We furthermore investigate new measures based on analysis of entropies to quantify the state of the system independent of specific models.