Bright solitons in the one-dimensional discrete Gross-Pitaevskii equation with dipole-dipole interactions

Goran Gligorić, Aleksandra Maluckov, Ljupčo Hadžievski, Boris A. Malomed

Research output: Contribution to journalArticlepeer-review

Abstract

A model of the Bose-Einstein condensate of dipolar atoms, confined in a combination of a cigar-shaped trap and deep optical lattice acting in the axial direction, is introduced, taking into regard the dipole-dipole (DD) and contact interactions. The model is based on the discrete nonlinear Schrödinger equation with an additional nonlocal term accounting for the DD interactions. The existence and stability of fundamental unstaggered solitons are studied for attractive and repulsive signs of both the local and nonlocal interactions. The DD forces strongly affect the shape and stability of on-site and intersite discrete solitons. The corresponding existence and stability regions in the parametric space are summarized in the form of diagrams, which feature a multiple stability exchange between the on-site and intersite families; in the limit of the dominating DD attraction, the on-site solitons are stable, while their intersite counterparts are not. We also demonstrate that the DD interactions reduce the Peierls-Nabarro barrier and enhance the mobility of the discrete solitons.

Original languageEnglish
Article number063615
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume78
Issue number6
DOIs
StatePublished - 22 Dec 2008

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