Solving the linear semiclassical Schrödinger equation on the real line

2021/01/31 by Arieh Iserles, Karolina Kropielnicka, Iserles, Arieh +5 · 1 citation
Mathematics · Engineering · #Numerical methods for differential equations #Electromagnetic Simulation and Numerical Methods #Spectral Theory in Mathematical Physics

paper · pdf · doi:10.48550/arxiv.2102.00413

Abstract

The numerical solution of a linear Schrödinger equation in the semiclassical regime is very well understood in a torus \mathbbT^d. A raft of modern computational methods are precise and affordable, while conserving energy and resolving high oscillations very well. This, however, is far from the case with regard to its solution in ℝ^d, a setting more suitable for many applications. In this paper we extend the theory of splitting methods to this end. The main idea is to derive the solution using a spectral method from a combination of solutions of the free Schrödinger equation and of linear scalar ordinary differential equations, in a symmetric Zassenhaus splitting method. This necessitates detailed analysis of certain orthonormal spectral bases on the real line and their evolution under the free Schrödinger operator.

Citations

• Efficient Computation of the Complex Error Function
• A note on the summation of Chebyshev series

Cited by

• Computing nonlinear Schrödinger equations with Hermite functions beyond harmonic traps

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