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Discrete Laplacian in a half‐space with a periodic surface potential I: Resolvent expansions, scattering matrix, and wave operators

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  • H. S. Nguyen
  • S. Richard
  • R. Tiedra de Aldecoa

Abstract

We present a detailed study of the scattering system given by the Neumann Laplacian on the discrete half‐space perturbed by a periodic potential at the boundary. We derive asymptotic resolvent expansions at thresholds and eigenvalues, we prove the continuity of the scattering matrix, and we establish new formulas for the wave operators. Along the way, our analysis puts into evidence a surprising relation between some properties of the potential, like the parity of its period, and the behaviour of the integral kernel of the wave operators.

Suggested Citation

  • H. S. Nguyen & S. Richard & R. Tiedra de Aldecoa, 2022. "Discrete Laplacian in a half‐space with a periodic surface potential I: Resolvent expansions, scattering matrix, and wave operators," Mathematische Nachrichten, Wiley Blackwell, vol. 295(5), pages 912-949, May.
    • Handle: RePEc:bla:mathna:v:295:y:2022:i:5:p:912-949
    DOI: 10.1002/mana.201900430
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