Ultracold and dense samples of ground-state molecules in lattice potentials

Hanns-Christoph Nägerl, Manfred J Mark, Elmar Haller, Mattias Gustavsson, Russell Hart, Johann G Danzl

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We produce an ultracold and dense sample of rovibronic ground state Cs(2) molecules close to the regime of quantum degeneracy, in a single hyperfine level, in the presence of an optical lattice. The molecules are individually trapped, in the motional ground state of an optical lattice well, with a lifetime of 8 s. For preparation, we start with a zero-temperature atomic Mott-insulator state with optimized double-site occupancy and efficiently associate weakly-bound dimer molecules on a Feshbach resonance. Despite extremely weak Franck-Condon wavefunction overlap, the molecules are subsequently transferred with >50% efficiency to the rovibronic ground state by a stimulated four-photon process. Our results present a crucial step towards the generation of Bose-Einstein condensates of ground-state molecules and, when suitably generalized to polar heteronuclear molecules such as RbCs, the realization of dipolar many-body quantum-gas phases in periodic potentials.
Original languageEnglish
Article number012015
JournalJournal of Physics Conference Series
Publication statusPublished - 1 Jan 2011


  • lattice potentials
  • quantum degeneracy
  • Feshbach resonance
  • optical lattice
  • optics


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