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Abstract: We produce an ultracold and dense sample of rovibronic ground state Cs 2molecules close to the regime of quantum degeneracy, in a single hyperfinelevel, in the presence of an optical lattice. The molecules are individuallytrapped, in the motional ground state of an optical lattice well, with alifetime of 8 s. For preparation, we start with a zero-temperature atomicMott-insulator state with optimized double-site occupancy and efficientlyassociate weakly-bound dimer molecules on a Feshbach resonance. Despiteextremely weak Franck-Condon wavefunction overlap, the molecules aresubsequently transferred with >50% efficiency to the rovibronic ground state bya stimulated four-photon process. Our results present a crucial step towardsthe generation of Bose-Einstein condensates of ground-state molecules and, whensuitably generalized to polar heteronuclear molecules such as RbCs, therealization of dipolar many-body quantum-gas phases in periodic potentials.



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

Fuente: https://arxiv.org/







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