Coupled-channels analysis of Feshbach resonances in a Mott insulator

Research output: Contribution to journalMeeting AbstractAcademic


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.
Original languageEnglish
Article numbere01.00023
Number of pages1
JournalBulletin of the American Physical Society
Issue number4
Publication statusPublished - 1 May 2019
Event50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting - Milwaukee, United States
Duration: 27 May 201931 May 2019
Conference number: 50


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