Collective-Mode Enhanced Matter-Wave Optics.

  title={Collective-Mode Enhanced Matter-Wave Optics.},
  author={Christian Deppner and Waldemar Herr and Merle Cornelius and Peter Stromberger and Tammo Sternke and Christoph Grzeschik and Alexander Grote and Jan Rudolph and Sven Herrmann and Markus C. Krutzik and Andr'e Wenzlawski and Robin Corgier and Eric Charron and D. Gu{\'e}ry-Odelin and Naceur Gaaloul and Claus L{\"a}mmerzahl and Achim Peters and Patrick Windpassinger and Ernst Maria Rasel},
  journal={Physical review letters},
  volume={127 10},
In contrast to light, matter-wave optics of quantum gases deals with interactions even in free space and for ensembles comprising millions of atoms. We exploit these interactions in a quantum degenerate gas as an adjustable lens for coherent atom optics. By combining an interaction-driven quadrupole-mode excitation of a Bose-Einstein condensate (BEC) with a magnetic lens, we form a time-domain matter-wave lens system. The focus is tuned by the strength of the lensing potential and the… 

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