Geodesic
Essential Spectrum of Schr\"odinger Operators on Periodic Graphs
Funkcionalʹnyj analiz i ego priloženiâ, Tome 52 (2018) no. 1, pp. 80-84.

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We give a description of the essential spectra of unbounded operators $\mathcal{H}_{q}$ on $L^{2}(\Gamma)$ determined by the Schrödinger operators $-d^{2}/dx^{2}+q(x)$ on the edges of $\Gamma$ and general vertex conditions. We introduce a set of limit operators of $\mathcal{H}_{q}$ such that the essential spectrum of $\mathcal{H}_{q}$ is the union of the spectra of limit operators. We apply this result to describe the essential spectra of the operators $\mathcal{H}_{q}$ with periodic potentials perturbed by terms slowly oscillating at infinity.
Keywords: periodic graph, Schrödinger operator on a graph, limit operator, essential spectrum. 
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V. S. Rabinovich. Essential Spectrum of Schr\"odinger Operators on Periodic Graphs. Funkcionalʹnyj analiz i ego priloženiâ, Tome 52 (2018) no. 1, pp. 80-84. http://geodesic.mathdoc.fr/item/FAA_2018_52_1_a9/

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