Precision measurements on a tunable Mott insulator of ultracold atoms

Mark, M.J. and Haller, Elmar and Lauber, K. and Danzl, J.G. and Daley, Andrew and Nägerl, H.-C. (2011) Precision measurements on a tunable Mott insulator of ultracold atoms. Physical Review Letters, 107 (17). 175301. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.107.175301)

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Abstract

We perform precision measurements on a Mott-insulator quantum state of ultracold atoms with tunable interactions. We probe the dependence of the superfluid-to-Mott-insulator transition on the interaction strength and explore the limits of the standard Bose-Hubbard model description. By tuning the on-site interaction energies to values comparable to the interband separation, we are able to quantitatively measure number-dependent shifts in the excitation spectrum caused by effective multibody interactions.

ORCID iDs

Mark, M.J., Haller, Elmar ORCID logoORCID: https://orcid.org/0000-0002-7951-1721, Lauber, K., Danzl, J.G., Daley, Andrew ORCID logoORCID: https://orcid.org/0000-0001-9005-7761 and Nägerl, H.-C.;
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