Local observation of antibunching in a trapped Fermi gas.
Local density fluctuations and density profiles of a Fermi gas are measured in situ and analyzed. In the quantum degenerate regime, the weakly interacting 6Li gas shows a suppression of the density fluctuations compared to the nondegenerate case, where atomic shot noise is observed. This manifestation of antibunching is a direct result of the Pauli principle and constitutes a local probe of quantum degeneracy. We analyze our data using the predictions of the fluctuation-dissipation theorem and the local density approximation, demonstrating a fluctuation-based temperature measurement.
Müller
Torben
T
Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
Zimmermann
Bruno
B
Meineke
Jakob
J
Brantut
Jean-Philippe
JP
Esslinger
Tilman
T
Moritz
Henning
H