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Phys. Rev. Lett. 92, 120404 (2004) [4 pages]

Nonspreading Wave Packets in Three Dimensions Formed by an Ultracold Bose Gas in an Optical Lattice

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Claudio Conti* and Stefano Trillo†
National Institute for the Physics of Matter, INFM, Università Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy

Received 22 May 2003; published 26 March 2004

We predict that an ultracold Bose gas in an optical lattice can give rise to a new form of condensation, namely, nonspreading 3D wave packets that 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 noninteracting atoms. This result also has strong implications for optical propagation in periodic structures.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.120404
DOI:
10.1103/PhysRevLett.92.120404
PACS:
03.75.Lm, 05.30.Jp, 42.65.Jx

*Electronic addresses: c.conti@ele.uniroma3.it

http://optow.ele.uniroma3.it

†Also with Department of Engineering, University of Ferrara, Via Saragat 1, 44100 Ferrara, Italy.

Electronic address: strillo@ing.unife.it

 
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