Collective oscillations of a Fermi gas in the unitarity limit: Temperature effects and the role of pair correlations - Condensed Matter > Other Condensed MatterReport as inadecuate




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Abstract: We present detailed measurements of the frequency and damping of threedifferent collective modes in an ultracold trapped Fermi gas of $^6$Li atomswith resonantly tuned interactions. The measurements are carried out over awide range of temperatures. We focus on the unitarity limit, where thescattering length is much greater than all other relevant length scales. Theresults are compared to theoretical calculations that take into account Pauliblocking and pair correlations in the normal state above the criticaltemperature for superfluidity. We show that these two effects nearly compensateeach other and the behavior of the gas is close to the one of a classical gas.



Author: S. Riedl, E. R. Sanchez Guajardo, C. Kohstall, A. Altmeyer, M. J. Wright, J. Hecker Denschlag, R. Grimm, G. M. Bruun, H. Smith

Source: https://arxiv.org/







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