arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.2501nlin.PS
收藏

变号非线性系数周期势场中带隙孤子的分岔

Bifurcation of gap solitons in periodic potentials with a sign-varying nonlinearity coefficient

Juan Belmonte-Beitia, Dmitry Pelinovsky

摘要:

我们解决的格罗斯-Pitaevskii(GP)方程与周期性的线性潜力和周期性的符号变化的非线性系数。与Abdullaev { \em et al.}以前的作品中的主张相反,[PRE{ \bf 77},016604(2008)]和Smerzi & Trombettoni [PRA { \bf 68},023613(2003)]中,我们证明了离散非线性薛定谔(DNLS)方程中的位间立方非线性项超出了紧束缚近似假设的适用范围。对于偶数线性势和奇数非线性系数,DNLS方程和半无限隙的其他约化方程具有五次非线性项,而不是这些项,这正确地描述了隙孤子的分叉。

英文摘要:

We address the Gross--Pitaevskii (GP) equation with a periodic linear potential and a periodic sign-varying nonlinearity coefficient. Contrary to the claims in the previous works of Abdullaev {\em et al.} [PRE {\bf 77}, 016604 (2008)] and Smerzi & Trombettoni [PRA {\bf 68}, 023613 (2003)], we show that the intersite cubic nonlinear terms in the discrete nonlinear Schrödinger (DNLS) equation appear beyond the applicability of assumptions of the tight-binding approximation. Instead of these terms, for an even linear potential and an odd nonlinearity coefficient, the DNLS equation and other reduced equations for the semi-infinite gap have the quintic nonlinear term, which correctly describes bifurcation of gap solitons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑