Matter X waves

Details Matter X waves Matter X waves

2003-08-13

arxiv.org/abs/physics/0308051v1

Phys. Rev. Lett. 92, 120404 (2004)

Physics

Atomic Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.92.120404

We predict that an ultra-cold Bose gas in an optical lattice can give rise to a new form of condensation, namely matter X waves. These are non-spreading 3D wave-packets which reflect the symmetry of the Laplacian with a negative effective mass along the lattice direction, and are allowed to exist in the absence of any trapping potential even in the limit of non-interacting atoms. This result has also strong implications for optical propagation in periodic structures

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