Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-04-28
New J. Phys. 13, 065027 (2011)
Physics
Condensed Matter
Quantum Gases
Scientific paper
10.1088/1367-2630/13/6/065027
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.
Denschlag Johannes Hecker
Grimm Rudolf
Guajardo Edmundo Sánchez
Kohstall Christoph
Riedl Stefan
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