Anharmonicity Induced Resonances for Ultracold Atoms and their Detection

Details Anharmonicity Induced Resonances for Ultracold Atoms and their Detection Anharmonicity Induced Resonances for Ultracold Atoms and their Detection

2009-07-16

arxiv.org/abs/0907.2906v2

New J. Phys. 12, 053016 (2010)

Physics

Condensed Matter

Quantum Gases

6 pages, 5 figures; expanded presentation

Scientific paper

10.1088/1367-2630/12/5/053016

When two atoms interact in the presence of an anharmonic potential, such as an optical lattice, the center of mass motion cannot be separated from the relative motion. In addition to generating a confinement-induced resonance (or shifting the position of an existing Feshbach resonance), the external potential changes the resonance picture qualitatively by introducing new resonances where molecular excited center of mass states cross the scattering threshold. We demonstrate the existence of these resonances, give their quantitative characterization in an optical superlattice, and propose an experimental scheme to detect them through controlled sweeping of the magnetic field.

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