On absence of embedded eigenvalues for Schrödinger operators with perturbed periodic potentials

Details On absence of embedded eigenvalues for Schrödinger operators with perturbed periodic potentials On absence of embedded eigenvalues for Schrödinger operators with perturbed periodic potentials

1999-04-16

arxiv.org/abs/math-ph/9904016v1

Commun. Part. Diff. Equat. 25(2000), no. 9-10, 1809 - 1826

Physics

Mathematical Physics

LATEX, 15 pages

Scientific paper

The problem of absence of eigenvalues imbedded into the continuous spectrum is considered for a Schr\"{o}dinger operator with a periodic potential perturbed by a sufficiently fast decaying ``impurity'' potential. Results of this type have previously been known for the one-dimensional case only. Absence of embedded eigenvalues is shown in dimensions two and three if the corresponding Fermi surface is irreducible modulo natural symmetries. It is conjectured that all periodic potentials satisfy this condition. Separable periodic potentials satisfy it, and hence in dimensions two and three Schr\"{o}dinger operator with a separable periodic potential perturbed by a sufficiently fast decaying ``impurity'' potential has no embedded eigenvalues.

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