Bose-Einstein condensation dynamics in three dimensions by the pseudospectral and finite-difference methods
摘要
We suggest a pseudospectral method for solving the three-dimensional time-dependent Gross-Pitaevskii (GP) equation and use it to study the resonance dynamics of a trapped Bose-Einstein condensate induced by a periodic variation in the atomic scattering length. When the frequency of oscillation of the scattering length is an even multiple of one of the trapping frequencies along the , , or direction, the corresponding size of the condensate executes resonant oscillation. Using the concept of the differentiation matrix, the partial-differential GP equation is reduced to a set of coupled ordinary differential equations which is solved by a fourth-order adaptive step-size control Runge-Kutta method. The pseudospectral method is contrasted with the finite-difference method for the same problem, where the time evolution is performed by the Crank-Nicholson algorithm. The latter method is illustrated to be more suitable for a three-dimensional standing-wave optical-lattice trapping potential.
引用
@article{arxiv.cond-mat/0210177,
title = {Bose-Einstein condensation dynamics in three dimensions by the pseudospectral and finite-difference methods},
author = {Paulsamy Muruganandam and Sadhan K Adhikari},
journal= {arXiv preprint arXiv:cond-mat/0210177},
year = {2025}
}
备注
14 Latex pages, 2 eps figures, accepted in Journal of Physics B