title: Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state.
abstract: We produce ultracold dense trapped samples of ^{87}Rb^{133}Cs molecules in their rovibrational ground state, with full nuclear hyperfine state control, by stimulated Raman adiabatic passage (STIRAP) with efficiencies of 90%. We observe the onset of hyperfine-changing collisions when the magnetic field is ramped so that the molecules are no longer in the hyperfine ground state. A strong quadratic shift of the transition frequencies as a function of applied electric field shows the strongly dipolar character of the RbCs ground-state molecule. Our results open up the prospect of realizing stable bosonic dipolar quantum gases with ultracold molecules.
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria and Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria.
authors.forename: Tetsu
authors.initials: T
authors.lastname: Takekoshi
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
authors.forename: Lukas
authors.initials: L
authors.lastname: Reichsöllner
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
authors.forename: Andreas
authors.initials: A
authors.lastname: Schindewolf
authors.affiliation: Joint Quantum Centre (JQC) Durham/Newcastle, Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Hutson
authors.affiliation: Joint Quantum Centre (JQC) Durham/Newcastle, Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: C Ruth
authors.initials: CR
authors.lastname: Le Sueur
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Bâtiment 505, 91405 Orsay Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Dulieu
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
authors.forename: Francesca
authors.initials: F
authors.lastname: Ferlaino
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria and Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria.
authors.forename: Rudolf
authors.initials: R
authors.lastname: Grimm
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
authors.forename: Hanns-Christoph
authors.initials: HC
authors.lastname: Nägerl