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CM-AMO SEMINAR | Ferromagnetic Domains and Roton Excitations in a Dilute Bose Superfluid

Tuesday, January 27, 2015
12:00 AM
335 West Hall

We present a new experimental scheme to modify the band structure of an optical lattice. In an admixed band, a novel quantum phase transition is identified from the observation of domains with ferromagnetic interactions. A careful study of the dynamics within a single domain suggests the appearance of roton excitations, which greatly suppress superfluidity near the quantum critical point.