Eigenvalue problem meets Sierpinski triangle: computing the spectrum of a non-self-adjoint random operator

The purpose of this paper is to prove that the spectrum of the non-self-adjoint one-particle Hamiltonian proposed by J. Feinberg and A. Zee (Phys. Rev. E 59 (1999), 6433--6443) has interior points. We do this by first recalling that the spectrum of this random operator is the union of the set of ℓ∞ eigenvalues of all infinite matrices with the same structure. We then construct an infinite matrix of this structure for which every point of the open unit disk is an ℓ∞ eigenvalue, this following from the fact that the components of the eigenvector are polynomials in the spectral parameter whose non-zero coefficients are ± 1's, forming the pattern of an infinite discrete Sierpinski triangle.

Subjects

Disordered systems

Jacobi matrix

Random matrix

Spectral theory

Mathematical Physics

Mathematics - Mathematical Physics

Mathematics - Spectral Theory

47B80

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Eigenvalue problem meets Sierpinski triangle: computing the spectrum of a non-self-adjoint random operator