Two-dimensional Fermi liquid with attractive interactions.

Authors :: Fröhlich B
Feld M
Vogt E
Koschorreck M
Köhl M
Berthod C
Giamarchi T
Source :: Physical review letters [Phys Rev Lett] 2012 Sep 28; Vol. 109 (13), pp. 130403. Date of Electronic Publication: 2012 Sep 26.
Publication Year :: 2012
Abstract: 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, properly taking into account the finite temperature, harmonic trap, and the averaging over several two-dimensional gases with different peak densities.