Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state

Abstract

We produce ultracold dense trapped samples of 87Rb133Cs 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.

7 pages, 5 figures; improved ground-state decay measurement, two-body decay model added

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• A High Phase-Space-Density Gas of Polar Molecules
• Quantum Gas of Deeply Bound Ground State Molecules
• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• Reactions of ultracold alkali metal dimers
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