We consider the difference Schrödinger equation (Formula presented.) where z is a complex variable, E is a spectral parameter, and h is a small positive parameter. If the potential v is an analytic function, then, for h sufficiently small, the analytic solutions to this equation have standard semi-classical behavior that can be described by means of an analog of the complex WKB method for differential equations. We assume that v has a simple pole and, in its neighborhood, we study the asymptotics of meromorphic solutions to the difference Schrödinger equation.

Original languageEnglish
Pages (from-to)1557-1573
Number of pages17
JournalApplicable Analysis
Volume100
Issue number7
Early online date16 Aug 2019
DOIs
StatePublished - 19 May 2021

    Scopus subject areas

  • Analysis
  • Applied Mathematics

    Research areas

  • 34M60, 39A45, G. Panasenko, Semiclassical asymptotics, complex WKB method, difference equations, meromorphic coefficients

ID: 45217809