title: Superfluidity with disorder in a thin film of quantum gas.
abstract: We investigate the properties of a strongly interacting superfluid gas of (6)Li(2) Feshbach molecules forming a thin film confined in a quasi-two-dimensional channel with a tunable random potential, creating a microscopic disorder. We measure the atomic current, extract the resistance of the film in a two-terminal configuration, and identify a superfluid state at low disorder strength, which evolves into a normal poorly conducting state for strong disorder. The transition takes place when the chemical potential reaches the percolation threshold of the disorder. The evolution of the conduction properties contrasts with the smooth behavior of the density and compressibility across the transition, measured in situ at equilibrium. These features suggest the emergence of a glasslike phase at strong disorder.
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Krinner
authors.forename: David
authors.initials: D
authors.lastname: Stadler
authors.forename: Jakob
authors.initials: J
authors.lastname: Meineke
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Brantut
authors.forename: Tilman
authors.initials: T
authors.lastname: Esslinger