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A useful formula for periodic Jacobi matrices on trees
Jess Banks1, Jonathan Breuer2, Jorge Garza-Vargas3
1Department of Mathematics, University of California, Berkeley, CA 94720.
Abstract:
We introduce a function of the density of states for periodic Jacobi matrices on trees and prove a useful formula for it in terms of entries of the resolvent of the matrix and its "half-tree" restrictions. This formula is closely related to the one-dimensional Thouless formula and associates a natural phase with points in the bands. This allows streamlined proofs of the gap labeling and Aomoto index theorems. We give a complete proof of gap labeling and sketch the proof of the Aomoto index theorem. We also prove a version of this formula for the Anderson model on trees.
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