Repulsively bound atom pairs in an optical lattice

K. Winkler, G. Thalhammer, F. Lang, R. Grimm, J. Hecker Denschlag (), A. J. Daley, A. Kantian, H. P. Büchler and P. Zoller
Additional contact information
K. Winkler: Institute for Experimental Physics
G. Thalhammer: Institute for Experimental Physics
F. Lang: Institute for Experimental Physics
R. Grimm: Institute for Experimental Physics
J. Hecker Denschlag: Institute for Experimental Physics
A. J. Daley: University of Innsbruck
A. Kantian: University of Innsbruck
H. P. Büchler: University of Innsbruck
P. Zoller: University of Innsbruck

Nature, 2006, vol. 441, issue 7095, 853-856

Abstract: An unlikely union In physics it is common for objects that attract each other to form stable bound states by lowering their energy. But under certain conditions, stable composite objects exist even for repulsive interactions. The creation of one such exotic bound state is reported this week. It consists of a pair of ultracold rubidium atoms in an optical lattice. The pairs are stable because two atoms sitting on a given site of an optical lattice with strong repulsive interactions cannot decay as they cannot convert their potential energy into kinetic energy, a phenomenon explained by the constraints of the Bose–Hubbard model for the structure of ultracold quantum gases.

Date: 2006
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DOI: 10.1038/nature04918

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