Precision Measurements on a Tunable Mott Insulator of Ultracold Atoms

Details Precision Measurements on a Tunable Mott Insulator of Ultracold Atoms Precision Measurements on a Tunable Mott Insulator of Ultracold Atoms

2011-07-09

arxiv.org/abs/1107.1803v1

Phys. Rev. Lett. 107, 175301 (2011)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.175301

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 multi-body interactions.

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