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Evidence for Ground- and Excited-State Efimov Trimers in a Three-State Fermi Gas | | J. R. Williams
; E. L. Hazlett
; J. H. Huckans
; R. W. Stites
; Y. Zhang
; K. M. O'Hara
; | | Date: |
6 Aug 2009 | | Abstract: | We observe enhanced three-body recombination in an ultracold three-component
$^6$Li Fermi gas with large but unequal scattering lengths attributable to an
excited Efimov trimer state near the three-atom scattering threshold. We find
excellent agreement between the measured three-body recombination rate and the
recombination rate calculated in the zero-range approximation where the only
free parameters are the Efimov parameters $kappa_*$ and $eta_*$. The value of
$kappa_*$ determined by the location of the Efimov resonance we observe at 895
G also predicts the locations of loss features previously observed near 130 and
500 G cite{Jochim08,OHara09} suggesting that all three features are associated
with universal Efimov trimer states. We also report on the first realization of
a quantum degenerate three-state Fermi gas with approximate SU(3) symmetry. | | Source: | arXiv, 0908.0789 | | Services: | Forum | Review | PDF | Favorites | |
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