title: Creation of ultracold ^{87}Rb^{133}Cs molecules in the rovibrational ground state.
abstract: We report the creation of a sample of over 1000 ultracold ^{87}Rb^{133}Cs molecules in the lowest rovibrational ground state, from an atomic mixture of ^{87}Rb and ^{133}Cs, by magnetoassociation on an interspecies Feshbach resonance followed by stimulated Raman adiabatic passage (STIRAP). We measure the binding energy of the RbCs molecule to be hc×3811.576(1)  cm^{-1} and the |v^{''}=0,J^{''}=0⟩ to |v^{''}=0,J^{''}=2⟩ splitting to be h×2940.09(6)  MHz. Stark spectroscopy of the rovibrational ground state yields an electric dipole moment of 1.225(3)(8) D, where the values in parentheses are the statistical and systematic uncertainties, respectively. We can access a space-fixed dipole moment of 0.355(2)(4) D, which is substantially higher than in previous work.
authors.affiliation: Department of Physics, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Peter K
authors.initials: PK
authors.lastname: Molony
authors.affiliation: Department of Physics, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Philip D
authors.initials: PD
authors.lastname: Gregory
authors.affiliation: Department of Physics, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Ji
authors.affiliation: Department of Physics, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Bo
authors.initials: B
authors.lastname: Lu
authors.affiliation: Department of Physics, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Michael P
authors.initials: MP
authors.lastname: Köppinger
authors.affiliation: Department of Chemistry, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: C Ruth
authors.initials: CR
authors.lastname: Le Sueur
authors.affiliation: Department of Chemistry, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Caroline L
authors.initials: CL
authors.lastname: Blackley
authors.affiliation: Department of Chemistry, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Hutson
authors.affiliation: Department of Physics, Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: Simon L
authors.initials: SL
authors.lastname: Cornish