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Quantum Electronics and Laser Science Conference

New developments in strongly interacting fermi gases

Rudolf Grimm

Published May 1, 2007• 0 citations
Publisher

Abstract

We present new results on collective excitation modes of a gas of 6Li atoms in the BEC-BCS crossover, and we report on our first results on interactions in a Fermi-Fermi mixture of 6Li and 40K atoms.
DOI
10.1109/qels.2007.4431789

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We present a measurement of the potential energy of an ultracold trapped gas of 40K atoms in the BCS-BEC crossover and investigate the temperature dependence of this energy at a wide Feshbach resonance, where the gas is in the unitarity limit. In particular, we study the ratio of the potential energy in the region of the unitarity limit to that of a noninteracting gas, and in the T=0 limit we extract the universal many-body parameter beta. We find beta=-0.54_{-0.12};{+0.05}; this value is consistent with previous measurements using 6Li atoms and also with recent theory and Monte Carlo calculations. This result demonstrates the universality of ultracold Fermi gases in the strongly interacting regime.