Ultracold atomic gas experiments have proven to be a versatile ground for studying quantum mechanics, quantum many-body physics, quantum simulation and computation. A precise model for two-body collisions in those systems is essential. Coupled-channels models can accurately describe the two-atom system at ultracold temperatures by detailed interaction potentials that are finetuned by just a few parameters, determined from experiment. We extend such a coupled-channels model to include the situation in a Mott insulator phase of ultracold bosonic atoms, where two atoms are confined to one lattice site. Of particular importance is the specific conversion between the on-site interaction energy, which remains finite in the lattice, and the scattering length around a Feshbach resonance that diverges. Recently spectroscopic techniques allowed for a precise experimental determination of the on-site interaction energy in a system of 7Li atoms, we analyze this data with our model to improve the precision of current lithium interaction potentials.
|Tijdschrift||Bulletin of the American Physical Society|
|Nummer van het tijdschrift||4|
|Status||Gepubliceerd - 1 mei 2019|
|Evenement||50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting - Milwaukee, Verenigde Staten van Amerika|
Duur: 27 mei 2019 → 31 mei 2019