title: Two-dimensional Fermi liquid with attractive interactions.
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.
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
authors.forename: B
authors.initials: B
authors.lastname: Fröhlich
authors.forename: M
authors.initials: M
authors.lastname: Feld
authors.forename: E
authors.initials: E
authors.lastname: Vogt
authors.forename: M
authors.initials: M
authors.lastname: Koschorreck
authors.forename: M
authors.initials: M
authors.lastname: Köhl
authors.forename: C
authors.initials: C
authors.lastname: Berthod
authors.forename: T
authors.initials: T
authors.lastname: Giamarchi