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Observation of interference between two molecular Bose-Einstein condensates

By Christoph Kohstall, Stefan Riedl, Edmundo Sánchez Guajardo, Leonid Sidorenkov, Johannes Hecker Denschlag and Rudolf Grimm


We have observed interference between two Bose-Einstein condensates of weakly bound Feshbach molecules of fermionic $^6$Li atoms. Two condensates are prepared in a double-well trap and, after release from this trap, overlap in expansion. We detect a clear interference pattern that unambiguously demonstrates the de Broglie wavelength of molecules. We verify that only the condensate fraction shows interference. For increasing interaction strength, the pattern vanishes because elastic collisions during overlap remove particles from the condensate wave function. For strong interaction the condensates do not penetrate each other as they collide hydrodynamically

Topics: Condensed Matter - Quantum Gases
Year: 2011
DOI identifier: 10.1088/1367-2630/13/6/065027
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