Ultracold dense samples of dipolar RbCs molecules in the rovibrational   and hyperfine ground state
  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. 
Tetsu Takekoshi, Lukas Reichs\"ollner, Andreas Schindewolf, Jeremy M.   Hutson, C. Ruth Le Sueur, Olivier Dulieu, Francesca ...
cond-mat.quant-gas physics.atom-ph quant-ph