Preparation and spectroscopy of a metastable Mott-insulator state with attractive interactions

M. J. Mark, E. Haller, K. Lauber, J. G. Danzl, A. Janisch, H. P. Buechler, Andrew Daley, H. -C. Naegerl

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Abstract

We prepare and study a metastable attractive Mott-insulator state formed with bosonic atoms in a three-dimensional optical lattice. Starting from a Mott insulator with Cs atoms at weak repulsive interactions, we use a magnetic Feshbach resonance to tune the interactions to large attractive values and produce a metastable state pinned by attractive interactions with a lifetime on the order of 10 s. We probe the (de) excitation spectrum via lattice modulation spectroscopy, measuring the interaction dependence of two-and three-body bound-state energies. As a result of increased on-site three-body loss we observe resonance broadening and suppression of tunneling processes that produce three-body occupation.

Original languageEnglish
Article number215302
Number of pages5
JournalPhysical Review Letters
Volume108
Issue number21
DOIs
Publication statusPublished - 25 May 2012

Keywords

  • spectroscopy
  • Mott insulator
  • bosonic atoms

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