B. Fröhlich, M. Feld, E. Vogt, M. Koschorreck, M. Köhl, C. Berthod, T. Giamarchi
We realize and study an attractively interacting two-dimensional Fermi liquid. Using momentum-resolved photoemission spectroscopy we measure the self-energy, determine the contact parameter of the short-range interaction potential, and find their dependence on the interaction strength. We successfully compare the measurements to a theoretical analysis taking properly into account finite temperature, the harmonic trap, and an inhomogeneous peak-density distribution of the array of two-dimensional gases.
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http://arxiv.org/abs/1206.5380
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