2 papers
math.SP2023
Spectral analysis of the Dirac operator with a singular interaction on a broken line
Dale Frymark, Markus Holzmann, Vladimir Lotoreichik
We consider the one-parametric family of self-adjoint realizations of the two-dimensional massive Dirac operator with a Lorentz scalar -shell interaction of strength $τ\in\mathb…
math.SP2022
The Spectrum of Self-Adjoint Extensions associated with Exceptional Laguerre Differential Expressions
Dale Frymark, Jessica Stewart Kelly
Exceptional Laguerre-type differential expressions make up an infinite class of Schrödinger operators having rational potentials and one limit-circle endpoint. In this manuscript,…