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arXiv · 1305.6632

Photon-atomic solitons in a Bose-Einstein condensate trapped in a soft optical lattice

Guangjiong Dong·Jiang Zhu·Weiping Zhang·Boris A. Malomed
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Abstract

We investigate the ground state (GS) of a collisionless Bose-Einstein condensate (BEC) trapped in a soft one-dimensional optical lattice (OL), which is formed by two counterpropagating optical beams perturbed by the BEC density profile through the local-field effect (LFE). We show that LFE gives rise to an envelope-deformation potential, a nonlocal potential resulting from the phase deformation, and an effective self-interaction of the condensate. As a result, stable photon-atomic lattice solitons, including an optical component, in the form of the deformation of the soft OL, in a combination with a localized matter-wave component, are generated in the blue-detuned setting, without any direct interaction between atoms. These self-trapped modes, which realize the system's GS, are essentially different from the gap solitons supported by the interplay of the OL potential and collisional interactions between atoms. A transition to tightly bound modes from loosely bound ones occurs with the increase of the number of atoms in the BEC.

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Guangjiong Dong, Jiang Zhu, Weiping Zhang, Boris A. Malomed. 2013-05-28. Photon-atomic solitons in a Bose-Einstein condensate trapped in a soft optical lattice. https://doi.org/10.1103/physrevlett.110.250401

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