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math.SP2019
Spectral enclosures for a class of block operator matrices
Juan Giribet, Matthias Langer, Francisco Martínez Pería +2
We prove new spectral enclosures for the non-real spectrum of a class of block operator matrices with self-adjoint operators and on the diagonal and operators $B…
math.SP2012★ 79 cited
Schrödinger operators with delta and delta'-potentials supported on hypersurfaces
Jussi Behrndt, Matthias Langer, Vladimir Lotoreichik
Self-adjoint Schrödinger operators with and -potentials supported on a smooth compact hypersurface are defined explicitly via boundary conditions. The spectral properties o…