Resonant demagnetization of a dipolar Bose-Einstein condensate in a three-dimensional optical lattice
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2013
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American Physical Society
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Abstract
We study dipolar relaxation of a chromium Bose-Einstein condensate loaded into a three-dimensional (3D) optical lattice. We observe dipolar relaxation resonances when the magnetic energy released during the inelastic collision matches an excitation towards higher-energy bands. Spectroscopy of these resonances for two orientations of the magnetic field provides a 3D band spectroscopy of the lattice. The narrowest resonance is registered for the lowest excitation energy. Its line shape is sensitive to the on-site interaction energy. We use such sensitivity to probe number squeezing in a Mott insulator.
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© 2013 American Physical Society. LPL is Unite Mixte (UMR 7538) of CNRS and of Universite Paris 13. We acknowledge financial support from Conseil Regional d'Ile-de-France and from Ministere de l'Enseignement Superieur et de la Recherche under DIM NanoK/IFRAF and a CPER contract. A.C. thanks CNRS for financial support. We thank J.V. Porto and M. Gajda for their suggestions and their comments during the preparation of the manuscript.