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- W3100715265 abstract "Let denote the field of algebraic numbers in A discrete group G is said to have the σ-multiplier algebraic eigenvalue property, if for every matrix A ∈ M d ((G, σ)), regarded as an operator on l 2(G)d, the eigenvalues of A are algebraic numbers, where σ ∈ Z 2(G, ) is an algebraic multiplier, and denotes the unitary elements of . Such operators include the Harper operator and the discrete magnetic Laplacian that occur in solid state physics. We prove that any finitely generated amenable, free or surface group has this property for any algebraic multiplier σ. In the special case when σ is rational (σ n=1 for some positive integer n) this property holds for a larger class of groups containing free groups and amenable groups, and closed under taking directed unions and extensions with amenable quotients. Included in the paper are proofs of other spectral properties of such operators." @default.
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- W3100715265 date "2005-12-20" @default.
- W3100715265 modified "2023-09-23" @default.
- W3100715265 title "Arithmetic Properties of Eigenvalues of Generalized Harper Operators on Graphs" @default.
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- W3100715265 doi "https://doi.org/10.1007/s00220-005-1489-0" @default.
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