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

Authors
  • Doçaj, Andris
  • Wall, Michael L.
  • Mukherjee, Rick
  • Hazzard, Kaden R. A.
Type
Published Article
Publication Date
Dec 22, 2015
Submission Date
Dec 18, 2015
Identifiers
DOI: 10.1103/PhysRevLett.116.135301
Source
arXiv
License
Yellow
External links

Abstract

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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