title: Observation of Pair Condensation in the Quasi-2D BEC-BCS Crossover.
abstract: The condensation of fermion pairs lies at the heart of superfluidity. However, for strongly correlated systems with reduced dimensionality the mechanisms of pairing and condensation are still not fully understood. In our experiment we use ultracold atoms as a generic model system to study the phase transition from a normal to a condensed phase in a strongly interacting quasi-two-dimensional Fermi gas. Using a novel method, we obtain the in situ pair momentum distribution of the strongly interacting system and observe the emergence of a low-momentum condensate at low temperatures. By tuning temperature and interaction strength, we map out the phase diagram of the quasi-2D BEC-BCS crossover.
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: M G
authors.initials: MG
authors.lastname: Ries
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: A N
authors.initials: AN
authors.lastname: Wenz
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Zürn
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Bayha
authors.affiliation: Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Boettcher
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Kedar
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: P A
authors.initials: PA
authors.lastname: Murthy
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Neidig
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Lompe
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Jochim