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arXiv · 1201.1008

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

Manfred J. Mark·Elmar Haller·Katharina Lauber·Johann G. Danzl·Alexander Janisch·Hans Peter Büchler·Andrew J. Daley·Hanns-Christoph Nägerl
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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 seconds. 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.

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Manfred J. Mark, Elmar Haller, Katharina Lauber, Johann G. Danzl, Alexander Janisch, Hans Peter Büchler, Andrew J. Daley, Hanns-Christoph Nägerl. 2012-01-04. Preparation and spectroscopy of a metastable Mott insulator state with attractive interactions. https://doi.org/10.1103/physrevlett.108.215302

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