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arXiv 0904.3131cond-mat.quant-gasnlin.PSphysics.comp-ph
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完全各向异性势阱中含时Gross-Pitaevskii方程的Fortran程序

Fortran programs for the time-dependent Gross-Pitaevskii equation in a fully anisotropic trap

P. Muruganandam, S. K. Adhikari

摘要:

我们开发了简单的数值算法的稳态和非稳态解的时间依赖的Gross-Pitaevskii(GP)方程描述的玻色-爱因斯坦凝聚体在超低温下的属性。特别是,我们认为算法涉及实时和实时传播的基础上的分步Crank-Nicolson方法。在一个单空间变量形式的GP方程中,我们考虑了一维线性、二维圆对称和三维球对称陷阱。在二维空间变量形式下,我们考虑了二维各向异性和三维轴对称势阱中的GP方程。还考虑了完全各向异性的三维GP方程。的化学势和根均方尺寸的定态的数值结果报告使用的所有情况下,并与以前获得的结果相比,时间传播程序。还提出了不同的陷阱对称性,使用实时传播程序的非平稳振荡的数值结果。文中还提供了一套用Fortran 77语言编制的方便的工作代码(共十二个程序)。在两个或三个空间变量的情况下,{Fortran 90/95版本比Fortran 77程序提供了一些简化},这些程序也包括在内(总共六个程序)。

英文摘要:

We develop simple numerical algorithms for both stationary and non-stationary solutions of the time-dependent Gross-Pitaevskii (GP) equation describing the properties of Bose-Einstein condensates at ultra low temperatures. In particular, we consider algorithms involving real and imaginary-time propagation based on a split-step Crank-Nicolson method. In a one-space-variable form of the GP equation we consider the one-dimensional linear, two-dimensional circularly symmetric, and the three-dimensional spherically-symmetric traps. In the two-space-variable form we consider the GP equation in two-dimensional anisotropic and three-dimensional axially-symmetric traps. The fully-anisotropic three-dimensional GP equation is also considered. Numerical results for the chemical potential and root-mean-square size of stationary states are reported using imaginary-time propagation programs for all the cases and compared with previously obtained results. Also presented are numerical results of non-stationary oscillation for different trap symmetries using real-time propagation programs. A set of convenient working codes developed in Fortran 77 are also provided for all these cases (twelve programs in all). In the case of two or three space variables, {Fortran 90/95 versions provide some simplification over the Fortran 77 programs}, and these programs are also included (six programs in all).

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