Strongly-Interacting Fermi Gases in Reduced Dimensions
Technical Report,01 Sep 2011,31 Aug 2015
North Carolina State University Raleigh United States
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All-optical trapping methods are used to produce and study a two-component strongly-interacting Fermi gas near a Feshbach resonance in a unique quasi-two-dimensional regime, where the cloud is far from three-dimensional, but not quite two-dimensional. We measure the radio-frequency spectra and the thermodynamic properties in spin-imbalanced mixtures to explore predictions of the phase diagram and high temperature superfluidity. Our recent measurements reveal that pairing energy and cloud profiles can be explained in part by a polaron model, in which an atom of one spin state is surrounded by a particle-hole cloud of the other spin state. However, a phase separation transition to a balanced central core is not predicted by the model. Our measurements provide the first benchmarks for predictions of the phase diagram for a spin-imbalanced mixtures in a quasi-two-dimensional system.