Band edge limit of the scattering matrix for quasi-one-dimensional discrete Schrödinger operators

Abstract

This paper is about the scattering theory for one-dimensional matrix Schrödinger operators with a matrix potential having a finite first moment. The transmission coefficients are analytically continued and extended to the band edges. An explicit expression is given for these extensions. The limits of the reflection coefficients at the band edges is also calculated.

minor corrections; appears in Complex Analysis and Operator Theory