Preparation and spectroscopy of a metastable mott-insulator state with attractive interactions Journal Article

Author(s): Mark, Manfred J; Haller, Elmar; Lauber, Katharina; Danzl, Johannes G; Janisch, Alexander; Büchler, Hans P; Daley, Andrew J; Nägerl, Hanns C
Article Title: Preparation and spectroscopy of a metastable mott-insulator state with attractive interactions
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.
Keywords: Cesium; excitation spectrum; Attractive value; Bosonic atoms; Bound-state energies; Lattice modulations; Magnetic Feshbach resonances; Meta-stable state; Mott insulators; Repulsive interactions; Three-dimensional optical lattice; Tunneling process; Molecular spectroscopy
Journal Title: Physical Review Letters
Volume: 108
Issue 21
ISSN: 1079-7114
Publisher: American Physical Society  
Date Published: 2012-05-25
DOI: 10.1103/PhysRevLett.108.215302
Notes: We are indebted to R. Grimm for generous support. We thank J. von Stecher, P. Johnson, and E. Tiesinga for fruitful discussions. We gratefully acknowledge funding by the Austrian Science Fund (FWF) within Project No. I153-N16 and within the framework of the European Science Foundation (ESF) EuroQUASAR collective research project QuDeGPM, and by the European Research Council (ERC) under Project No. 278417.
Open access: yes (repository)
IST Austria Authors
  1. Johann Danzl
    31 Danzl
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