Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Quantum Gases (Fermions) I

Q 25.1: Vortrag

Montag, 5. März 2018, 16:15–16:30, K 1.022

Probing homogeneous two-dimensional Fermi gases in momentum space — •Lennart Sobirey, Niclas Luick, Klaus Hueck, Fynn Förger, Jonas Siegl, Thomas Lompe, and Henning Moritz — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Ultracold two-dimensional Fermi gases are uniquely suited to investigate the interplay of reduced dimensionality and strong interactions in quantum many-body systems. Here, we report on our realization of an ultracold 2D Fermi gas trapped in a homogeneous disk-shaped potential. This system is ideally suited to measure non-local quantities such as correlation functions and the momentum distribution. Furthermore, homogeneous systems simplify the creation of quantum phases which exist only in narrow regions of the phase diagram. To confine the homogeneous gas, we radially confine it by a ring-shaped blue-detuned beam with steep walls. We perform matter wave focusing to extract its momentum distribution and directly observe Pauli blocking in a near unity occupation of momentum states.