Characterization of the essential spectrum of the Neumann–Poincaré operator in 2D domains with corner via Weyl sequences

  • Eric Bonnetier

    Université Grenoble-Alpes, Grenoble, France
  • Hai Zhang

    The Hong Kong University of Science and Technology, Hong Kong
Characterization of the essential spectrum of the Neumann–Poincaré operator in 2D domains with corner via Weyl sequences cover

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Abstract

The Neumann–Poincaré (NP) operator naturally appears in the context of metamaterials as it may be used to represent the solutions of elliptic transmission problems via potentiel theory. In particular, its spectral properties are closely related to the well-posedness of these PDE’s, in the typical case where one considers a bounded inclusion of homogeneous plasmonic metamaterial embedded in a homogeneous background dielectric medium. In a recent work, M. Perfekt and M. Putinar have shown that the NP operator of a 2D curvilinear polygon has an essential spectrum, which depends only on the angles of the corners. Their proof is based on quasi-conformal mappings and techniques from complex-analysis. In this work, we characterise the spectrum of the NP operator for a 2D domain with corners in terms of elliptic corner singularity functions, which gives insight on the behaviour of generalized eigenmodes.

Cite this article

Eric Bonnetier, Hai Zhang, Characterization of the essential spectrum of the Neumann–Poincaré operator in 2D domains with corner via Weyl sequences. Rev. Mat. Iberoam. 35 (2019), no. 3, pp. 925–948

DOI 10.4171/RMI/1075