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Ultracold nonreactive molecules in an optical lattice: connecting chemistry to many-body physics

  • Doçaj, Andris
  • Wall, Michael L.
  • Mukherjee, Rick
  • Hazzard, Kaden R. A.
Published Article
Publication Date
Dec 22, 2015
Submission Date
Dec 18, 2015
DOI: 10.1103/PhysRevLett.116.135301
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We derive effective lattice models for ultracold bosonic or fermionic nonreactive molecules (NRMs) in an optical lattice, analogous to the Hubbard model that describes ultracold atoms in a lattice. In stark contrast to the Hubbard model, which is commonly assumed to accurately describe NRMs, we find that the single on-site interaction parameter $U$ is replaced by a multi-channel interaction, whose properties we elucidate. The complex, multi-channel collisional physics is unrelated to dipolar interactions, and so occurs even in the absence of an electric field or for homonuclear molecules. We find a crossover between coherent few-channel models and fully incoherent single-channel models as the lattice depth is increased. We show that the effective model parameters can be determined in lattice modulation experiments, which consequently measure molecular collision dynamics with a vastly sharper energy resolution than experiments in an ultracold gas.

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