简介: |
Measuring the collective oscillation frequencies of a trapped atomic gas is a useful tool to probe its thermodynamic properties. Previously, this technique was performed only with the lowest order collective modes, namely the surface modes (e.g. sloshing and quadrupole modes), and the breathing modes. Higher longitudinal modes with richer nodal structures inside the cloud have not been investigated mainly because of the difficulty to excite such modes. In this talk, I would present our study on the higher order longitudinal collective modes in an elongated a Fermi gas with unitarity-limited interactions. Unlike the lowest order modes which are temperature independent, these modes can be used to probe the Equation of State (EoS) of the gas at higher temperatures. We performed precise measurement of the oscillation frequencies, and observed a good agreement between our measurements and the predictions using the EoS measured by the MIT group [1].
References:
[1] Mark J. H. Ku et al., Science 335, 563-567 (2012).
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