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Q: Fachverband Quantenoptik und Photonik
Q 48: Quantum Gases (Fermions) III
Q 48.2: Vortrag
Mittwoch, 7. März 2018, 14:15–14:30, K 1.022
Non-Equilibrium Mass Transport in the 1D Fermi-Hubbard Model — •Sebastian Scherg1,2, Thomas Kohlert1,2, Henrik Lüschen1,2, Pranjal Bordia1,2, Jan Stolpp1, Jacek Herbrych3,4, Fabian Heidrich-Meisner1, Ulrich Schneider5, Monika Aidelsburger1,2, and Immanuel Bloch1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München, Schellingstr. 4, 80799 Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA — 4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA — 5Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
We experimentally and numerically investigate the sudden expansion of interacting Fermions in a one-dimensional lattice. Focusing on initial states with more than half filling, we observe a phase separation of singlons (quickly expanding particles on singly occupied lattice sites) and doublons (slow particles on doubly occupied lattice sites). We discuss evidence of quantum distillation in the limit of large interactions, occuring if singlons distill out of the doublon cloud, leading to a contraction of the doublon region in the cloud. For initial states with less than half filling, we find a phase of singlons expanding nearly independently of the interaction strength, which is in contrast to the behavior of Bosons. We attribute the weak effect of interactions to a less efficient generation of dynamical doublons due to the Pauli principle.