Virial Theorem and Universality in a Unitary Fermi Gas

Details Virial Theorem and Universality in a Unitary Fermi Gas Virial Theorem and Universality in a Unitary Fermi Gas

2005-03-25

arxiv.org/abs/cond-mat/0503620v2

Phys.Rev.Lett.95:120402,2005

Physics

Condensed Matter

Other Condensed Matter

5 pages and 2 figures

Scientific paper

10.1103/PhysRevLett.95.120402

Unitary Fermi gases, where the scattering length is large compared to the interparticle spacing, can have universal properties, which are independent of the details of the interparticle interactions when the range of the scattering potential is negligible. We prepare an optically-trapped, unitary Fermi gas of $^6$Li, tuned just above the center of a broad Feshbach resonance. In agreement with the universal hypothesis, we observe that this strongly-interacting many-body system obeys the virial theorem for an ideal gas over a wide range of temperatures. Based on this result, we suggest a simple volume thermometry method for unitary gases. We also show that the observed breathing mode frequency, which is close to the unitary hydrodynamic value over a wide range of temperature, is consistent with a universal hydrodynamic gas with nearly isentropic dynamics.

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