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). ISSN 0031-9007

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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.