Ultracold Dense Samples of Dipolar RbCs Molecules in the Rovibrational and Hyperfine Ground State

by T. Takekoshi, L. Reichsöllner, A. Schindewolf, J. M. Hutson, C. R. Le Sueur, O. Dulieu, F. Ferlaino, R. Grimm, H.-C. Nägerl

Abstract:

We produce ultracold dense trapped samples of Rb87Cs133 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.

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Reference:

Ultracold Dense Samples of Dipolar RbCs Molecules in the Rovibrational and Hyperfine Ground State,
T. Takekoshi, L. Reichsöllner, A. Schindewolf, J. M. Hutson, C. R. Le Sueur, O. Dulieu, F. Ferlaino, R. Grimm, H.-C. Nägerl,
Phys. Rev. Lett., volume 113, 2014.

Bibtex Entry:

@article{PhysRevLett.113.205301,
  title = {Ultracold Dense Samples of Dipolar RbCs Molecules in the Rovibrational and Hyperfine Ground State},
  author = {Takekoshi, T. and Reichsöllner, L. and Schindewolf, A. and Hutson, J. M. and Le Sueur, C. R. and Dulieu, O. and Ferlaino, F. and Grimm, R. and Nägerl, H.-C.},
  journal = {Phys. Rev. Lett.},
  volume = {113},
  issue = {20},
  pages = {205301},
  numpages = {5},
  year = {2014},
  month = {Nov},
  abstract = {We produce ultracold dense trapped samples of Rb87Cs133 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.},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevLett.113.205301},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.113.205301},
  arXiv = {http://arxiv.org/abs/1405.6037}
}