Examination of eigenvalues and spectral singularities of a discrete Dirac operator with an interaction point

Abstract

In this paper, the main content is the consideration of the concepts of eigenvalues and spectral singularities of an operator generated by a discrete Dirac system in $ℓ_2(Z, C^2 )$ with an interior interaction point. Defining a transfer matrix M enables us to present a relationship between the $M_{22}$ component of this matrix and Jost functions of mentioned Dirac operator so that its eigenvalues and spectral properties can be studied. Finally, some special cases are examined where the impulsive condition possesses certain symmetries.