Precision measurements on a tunable Mott insulator of ultracold atoms Journal Article

Author(s): Mark, Manfred J; Haller, Elmar; Lauber, Katharina; Danzl, Johannes G; Daley, Andrew J; Nägerl, Hanns C
Article Title: Precision measurements on a tunable Mott insulator of ultracold atoms
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.
Keywords: QUANTUM THEORY; excitation spectrum; Quantum state; ultracold atoms; Interaction strength; Mott insulators; Bose Hubbard model; Interaction energies; Interband; Multi-body interactions; Precision measurement
Journal Title: Physical Review Letters
Volume: 107
Issue 17
ISSN: 1079-7114
Publisher: American Physical Society  
Date Published: 2011-10-18
DOI: 10.1103/PhysRevLett.107.175301
Notes: We are indebted to R. Grimm for generous support. We thank D. Boyanovsky, H. Büchler, P. Johnson, W. Niedenzu, and E. Tiesinga for fruitful discussions. We gratefully acknowledge funding by the Austrian Science Fund (FWF) within project I153-N16 and within the framework of the European Science Foundation (ESF) EuroQUASAR collective research project QuDeGPM.
Open access: yes (repository)