Spectra of magnetic chain graphs: coupling constant perturbations

Abstract

We analyze spectral properties of a quantum graph in the form of a ring chain with a $\delta$ coupling in the vertices exposed to a homogeneous magnetic field perpendicular to the graph plane. We find the band spectrum in the case when the chain exhibits a translational symmetry and study the discrete spectrum in the gaps resulting from changing a finite number of vertex coupling constants. In particular, we discuss in details some examples such as perturbations of one or two vertices, weak perturbation asymptotics, and a pair of distant perturbations.

20 pages, 5 figures

References in corpus (2)

• Quantum wires with magnetic fluxes
• Localization effects in a periodic quantum graph with magnetic field and spin-orbit interaction

Cited by in corpus (3)

• Green's function approach for quantum graphs: an overview
• Cantor spectra of magnetic chain graphs
• Spectral properties of magnetic chain graphs