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An ultracold high-density sample of rovibronic ground-state molecules in an optical lattice

Danzl, J.G.; Mark, M.J.; Haller, E.; Gustavsson, M.; Hart, R.; Aldegunde, J.; Hutson, J.M.; Nägerl, H.C.

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Authors

J.G. Danzl

M.J. Mark

E. Haller

M. Gustavsson

R. Hart

J. Aldegunde

H.C. Nägerl



Abstract

Control over all internal and external degrees of freedom of molecules at the level of single quantum states will enable a series of fundamental studies in physics and chemistry. In particular, samples of ground-state molecules at ultralow temperatures and high number densities will facilitate new quantum-gas studies and future applications in quantum information science. However, high phase-space densities for molecular samples are not readily attainable because efficient cooling techniques such as laser cooling are lacking. Here we produce an ultracold and dense sample of molecules in a single hyperfine level of the rovibronic ground state with each molecule individually trapped in the motional ground state of an optical lattice well. Starting from a zero-temperature atomic Mott-insulator state with optimized double-site occupancy, weakly bound dimer molecules are efficiently associated on a Feshbach resonance and subsequently transferred to the rovibronic ground state by a stimulated four-photon process with >50% efficiency. The molecules are trapped in the lattice and have a lifetime of 8 s. Our results present a crucial step towards Bose–Einstein condensation of ground-state molecules and, when suitably generalized to polar heteronuclear molecules, the realization of dipolar quantum-gas phases in optical lattices.

Citation

Danzl, J., Mark, M., Haller, E., Gustavsson, M., Hart, R., Aldegunde, J., …Nägerl, H. (2010). An ultracold high-density sample of rovibronic ground-state molecules in an optical lattice. Nature Physics, 6(4), 265-270. https://doi.org/10.1038/nphys1533

Journal Article Type Article
Publication Date Apr 1, 2010
Deposit Date Feb 2, 2012
Publicly Available Date Mar 28, 2024
Journal Nature Physics
Print ISSN 1745-2473
Electronic ISSN 1745-2481
Publisher Nature Research
Peer Reviewed Peer Reviewed
Volume 6
Issue 4
Pages 265-270
DOI https://doi.org/10.1038/nphys1533

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