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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Excitations of a superfluid in a three-dimensional optical lattice
Christian Schori1, Thilo Stöferle, Henning Moritz
1Institute of Quantum Electronics, ETH Zürich Hönggerberg, CH-8093 Zürich, Switzerland. Schori@phys.ethz.ch
Abstract:
We prepare a Bose-Einstein condensed gas in a three-dimensional optical lattice and study the excitation spectrum of the superfluid phase for different interaction strengths. We probe the response of the system by modulating the depth of the optical lattice along one axis. The interactions can be controlled independently by varying the tunnel coupling along the other two lattice axes. In the weakly interacting regime we observe a small susceptibility of the superfluid to excitations, while for stronger interactions an unexpected resonance appears in the excitation spectrum. In addition we measure the coherent fraction of the atomic gas, which determines the depletion of the condensate.
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