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    A high phase-space-density gas of polar molecules

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    0808.2963v2.pdf
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    Genre
    Pre-print
    Date
    2008-10-10
    Author
    Ni, KK
    Ospelkaus, S
    De Miranda, MHG
    Pe'er, A
    Neyenhuis, B
    Zirbel, JJ
    Kotochigova, S
    Julienne, PS
    Jin, DS
    Ye, J
    Subject
    quant-ph
    quant-ph
    cond-mat.other
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/4224
    
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    DOI
    10.1126/science.1163861
    Abstract
    A quantum gas of ultracold polar molecules, with long-range and anisotropic interactions, not only would enable explorations of a large class of many-body physics phenomena but also could be used for quantum information processing. We report on the creation of an ultracold dense gas of potassium-rubidium ( 40K87Rb) polar molecules. Using a single step of STIRAP (stimulated Raman adiabatic passage) with two-frequency laser irradiation, we coherently transfer extremely weakly bound KRb molecules to the rovibrational ground state of either the triplet or the singlet electronic ground molecular potential. The polar molecular gas has a peak density of 1012 per cubic centimeter and an expansion-determined translational temperature of 350 nanokelvin. The polar molecules have a permanent electric dipole moment, which we measure with Stark spectroscopy to be 0.052(2) Debye (1 Debye = 3.336 × 10-30 coulomb-meters) for the triplet rovibrational ground state and 0.566(17) Debye for the singlet rovibrational ground state.
    Citation to related work
    American Association for the Advancement of Science (AAAS)
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    Science
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/4206
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