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18 April 2024 |
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A High Phase-Space-Density Gas of Polar Molecules in the Rovibrational Ground State | | K.-K. Ni
; S. Ospelkaus
; M. H. G. de Miranda
; A. Pe'er
; B. Neyenhuis
; J. J. Zirbel
; S. Kotochigova
; P. S. Julienne
; D. S. Jin
; J. Ye
; | | Date: |
21 Aug 2008 | | Abstract: | A quantum gas of ultracold polar molecules, with long-range and anisotropic
interactions, would not only enable explorations of a large class of many-body
physics phenomena, but could also be used for quantum information processing.
We report on the creation of an ultracold dense gas of 40K87Rb polar molecules.
Using a single step of STIRAP (STImulated Raman Adiabatic Passage) via
two-frequency laser irradiation, we coherently transfer extremely weakly bound
KRb molecules to the rovibrational ground state of the triplet electronic
ground potential. The polar molecular gas has a peak density of 10^12 cm^-3,
and an expansion-determined translational temperature of 350 nK. The
rovibrational ground-state molecules have a permanent electric dipole moment,
measured via Stark spectroscopy to be 0.052(2) Debye. We have recently extended
this technique to transfer to the absolute rovibrational ground state (singlet)
where the measured electric dipole moment is 0.566(17) Debye. | | Source: | arXiv, 0808.2963 | | Services: | Forum | Review | PDF | Favorites | |
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