arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1303.3471math.NAcs.NAphysics.comp-phquant-ph
收藏

势Crank-Nicolson方案在半无限条上的Schrödinger方程中的分裂

The splitting in potential Crank-Nicolson scheme with discrete transparent boundary conditions for the Schrödinger equation on a semi-infinite strip

CEA, DAM, DIF(法国原子能委员会);National Research University Higher School of Economics(国立研究型高等经济大学);National Research University Moscow Power Engineering Institute(国立研究型莫斯科动力工程学院)

Bernard Ducomet, Alexander Zlotnik, Ilya Zlotnik

AI总结:

本文提出了一种适用于半无限条上Schrödinger方程的分裂Crank-Nicolson方案,结合离散透明边界条件,实现了无条件时间稳定性,并通过FFT算法高效求解,验证了其在隧道效应中的有效性。

摘要:

我们考虑在半无限条上一个广义的二维时间依赖Schrödinger方程(具有变量系数)的初始-边界值问题。对于Crank-Nicolson型有限差分方案及其近似或离散透明边界条件(TBCs),应用Strang型的势分裂。对于所得到的方法,证明了其时间上的无条件统一$ L^2 $-稳定性。由于分裂,现在开发出一种有效的直接算法,利用FFT来实现该方法的离散TBC,适用于一般势能。包含关于矩形屏障隧道效应的数值结果,以及详细的实用误差分析,确认了该方法的良好性质。

英文摘要:

We consider an initial-boundary value problem for a generalized 2D time-dependent Schrodinger equation (with variable coefficients) on a semi-infinite strip. For the Crank-Nicolson-type finite-difference scheme with approximate or discrete transparent boundary conditions (TBCs), the Strang-type splitting with respect to the potential is applied. For the resulting method, the unconditional uniform in time $L^2$-stability is proved. Due to the splitting, an effective direct algorithm using FFT is developed now to implement the method with the discrete TBC for general potential. Numerical results on the tunnel effect for rectangular barriers are included together with the detailed practical error analysis confirming nice properties of the method.

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。

↑