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arXiv · 0812.4836

Interference of interacting matter waves

Mattias Gustavsson·Elmar Haller·Manfred J. Mark·Johann G. Danzl·Russell Hart·Andrew J. Daley·Hanns-Christoph Naegerl
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Abstract

The phenomenon of matter wave interference lies at the heart of quantum physics. It has been observed in various contexts in the limit of non-interacting particles as a single particle effect. Here we observe and control matter wave interference whose evolution is driven by interparticle interactions. In a multi-path matter wave interferometer, the macroscopic many-body wave function of an interacting atomic Bose-Einstein condensate develops a regular interference pattern, allowing us to detect and directly visualize the effect of interaction-induced phase shifts. We demonstrate control over the phase evolution by inhibiting interaction-induced dephasing and by refocusing a dephased macroscopic matter wave in a spin-echo type experiment. Our results show that interactions in a many-body system lead to a surprisingly coherent evolution, possibly enabling narrow-band and high-brightness matter wave interferometers based on atom lasers.

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Mattias Gustavsson, Elmar Haller, Manfred J. Mark, Johann G. Danzl, Russell Hart, Andrew J. Daley, Hanns-Christoph Naegerl. 2008-12-28. Interference of interacting matter waves. https://doi.org/10.1088/1367-2630%2F12%2F6%2F065029

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