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arXiv 1003.2701cond-mat.quant-gas
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Gros-Pitaevskii方程的反问题

The inverse problem for the Gross - Pitaevskii equation

Boris A. Malomed, Yury A. Stepanyants

摘要:

提出了两种不同的方法来产生固定的Gros-Pitaevskii方程(GPE)的广泛类别的精确解。Kondrat'ev和Miller(1966)的工作建议的第一种方法适用于一维(1D)GPE。它是基于GPE和可积加德纳方程之间的相似性,后者方程的所有解(包括稳态和非稳态解)生成GPE的精确解,势函数与相应的解成比例。第二种方法是基于GPE的“逆问题”,即构造一个势函数,它为方程提供了一个理想的解。系统的结果,提出了一维和二维的情况下。这两种方法都说明了各种本地化的解决方案,包括孤涡,在GPE的吸引力和排斥力的非线性。一维解决方案的稳定性进行了测试,通过直接模拟的时间依赖的GPE。

英文摘要:

Two different methods are proposed for the generation of wide classes of exact solutions to the stationary Gross - Pitaevskii equation (GPE). The first method, suggested by the work by Kondrat'ev and Miller (1966), applies to one-dimensional (1D) GPE. It is based on the similarity between the GPE and the integrable Gardner equation, all solutions of the latter equation (both stationary and nonstationary ones) generating exact solutions to the GPE, with the potential function proportional to the corresponding solutions. The second method is based on the "inverse problem" for the GPE, i.e. construction of a potential function which provides a desirable solution to the equation. Systematic results are presented for 1D and 2D cases. Both methods are illustrated by a variety of localized solutions, including solitary vortices, for both attractive and repulsive nonlinearity in the GPE. The stability of the 1D solutions is tested by direct simulations of the time-dependent GPE.

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