Monday, March 12, 2012

1011.0599 (Jerome C. Sanders et al.)

Bound states of two bosons in an optical lattice near an association
resonance
   [PDF]

Jerome C. Sanders, Otim Odong, Juha Javanainen, Matt Mackie
We model two bosons in an optical lattice near a Feshbach or photoassociation resonance, focusing on the Bose-Hubbard model in one dimension. Whereas the usual atoms-only theory with a tunable scattering length yields one bound state for a molecular dimer for either attractive or repulsive atom-atom interaction, an atom-molecule theory gives two bound states that may represent attractively and repulsively bound dimers occurring simultaneously. Such unusual molecular physics should be observable for an atom-molecule coupling strength comparable to the width of the dissociation continuum of the lattice dimer, for example, using narrow Feshbach resonances in Na, $^{87}$Rb, and $^{133}$Cs or low-intensity photoassociation in $^{174}$Yb.
View original: http://arxiv.org/abs/1011.0599

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