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Magnetic Dirichlet Laplacian in curved waveguides

Barseghyan Diana, Bernstein Swanhild, Schneider Baruch, Zimmermann Martha Lina

Opuscula Mathematica

2025

Vol. 45, no. 3

293--305

For a two-dimensional curved waveguide, it is well known that the spectrum of the Dirichlet Laplacian is unstable with respect to waveguide deformations. This means that if the waveguide is a straight strip then the spectrum of the Dirichlet Laplacian is purely essential. From the other hand, the perturbation of the straight strip produces eigenvalues below the essential spectrum. In this paper, the Dirichlet–Laplace operator with a magnetic field is considered. We explicitly prove that the spectrum of the magnetic Laplacian is stable under small but non-local deformations of the waveguide.