Volume 3, Issue 3
An Exact Absorbing Boundary Condition for the Schrödinger Equation with Sinusoidal Potentials at Infinity

Chunxiong Zheng

Commun. Comput. Phys., 3 (2008), pp. 641-658.

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  • Abstract

In this paper we study numerical issues related to the Schro¨dinger equation with sinusoidal potentials at infinity. An exactabsorbing boundary condition in a form of Dirichlet-to-Neumann mapping is derived. This boundary condition is based on an analytical expression of the logarithmic derivative of the Floquet solution to Mathieu’s equation, which is completely new to the author’s knowledge. The implementation of this exact boundary condition is discussed, and a fast evaluation method is used to reduce the computation burden arising from the involved half-order derivative operator. Somenumericaltestsaregiventoshowtheperformanceoftheproposedabsorbing boundary conditions.

  • History

Published online: 2008-03

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