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

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dc.creatorKuchment, Peter
dc.creatorVainberg, Boris
dc.date1999-04-16
dc.date.accessioned2026-07-25T22:34:58Z
dc.descriptionThe problem of absence of eigenvalues imbedded into the continuous spectrum is considered for a Schrödinger 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 Schrödinger operator with a separable periodic potential perturbed by a sufficiently fast decaying ``impurity'' potential has no embedded eigenvalues.
dc.descriptionLATEX, 15 pages
dc.identifierhttps://arxiv.org/abs/math-ph/9904016
dc.identifierhttp://arxiv.org/abs/math-ph/9904016
dc.identifierCommun. Part. Diff. Equat. 25(2000), no. 9-10, 1809 - 1826
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/90470
dc.subjectMathematical Physics
dc.subjectSpectral Theory
dc.subject35P99, 47A55, 47F05
dc.titleOn absence of embedded eigenvalues for Schrödinger operators with perturbed periodic potentials
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