Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 67: Cold Atomic Gases and Superfluids

TT 67.1: Talk

Thursday, March 19, 2020, 16:30–16:45, HSZ 204

Real time dynamics of impurity and disorder scattering with interacting Fermion wave packets — •Sebastian Eggert, Kevin Jägering, Imke Schneider, Benajmin Nagler, and Artur Widera — Physik and OPTIMAS, Technische Universität Kaiserslautern

Recent advances for ultra-cold gases allow the controlled scattering by disorder and localized impurities using moving interacting Fermion wave packets in a trap after a quick displacement in position. We analyze the damping and scattering behavior from large scale numerical t-DMRG simulations in 1D as a function of interaction, displacement and disorder strength in a regime where a comparison with our experiments is possible. Attractive interactions make the wave-packets more susceptible for both single impurities and disorder scattering, which leads to a significant larger damping and quicker breakdown of the oscillations. Repulsive interactions have a much smaller effect, but overall a reduction of scattering can be observed. The corresponding experiments for 3D scattering show maximum stability and minimal damping near the unitary point.