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Bright Bose-Einstein Gap Solitons of Atoms with Repulsive Interaction

Bernd EiermannKirchhoff Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, GermanyTh. AnkerKirchhoff Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, GermanyM. AlbiezKirchhoff Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, GermanyM. TaglieberMax-Planck-Institut für Quantenoptik und Sektion Physik der Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, GermanyPhilipp TreutleinMax-Planck-Institut für Quantenoptik und Sektion Physik der Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, GermanyKarl-Peter MarzlinDepartment of Physics and Astronomy, Quantum Information Science Group, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4Markus K. OberthalerKirchhoff Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
2004en
ABI

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We report on the first experimental observation of bright matter wave solitons for 87Rb atoms with repulsive atom-atom interaction. This counterintuitive situation arises inside a weak periodic potential, where anomalous dispersion can be realized at the Brillouin zone boundary. If the coherent atomic wave packet is prepared at the corresponding band edge, a bright soliton is formed inside the gap. The strength of our system is the precise control of preparation and real time manipulation, allowing the systematic investigation of gap solitons.

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