Locating conical degeneracies in the spectra of parametric self-adjoint matrices

Abstract

A simple iterative scheme is proposed for locating the parameter values for which a 2-parameter family of real symmetric matrices has a double eigenvalue. The convergence is proved to be quadratic. An extension of the scheme to complex Hermitian matrices (with 3 parameters) and to location of triple eigenvalues (5 parameters for real symmetric matrices) is also described. Algorithm convergence is illustrated in several examples: a real symmetric family, a complex Hermitian family, a family of matrices with an "avoided crossing" (no covergence) and a 5-parameter family of real symmetric matrices with a triple eigenvalue.

19 pages, 8 figures; improved following referees' suggestions

References in corpus (3)

• The electronic properties of graphene
• Merging of Dirac points in a two-dimensional crystal
• Wave packets in Honeycomb Structures and Two-Dimensional Dirac Equations

Cited by in corpus (1)

• Decompositions and coalescing eigenvalues of symmetric definite pencils depending on parameters