Magnetic perturbations of the Robin Laplacian in the strong coupling limit

Rayan Fahs

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arXiv · 2111.01416

Magnetic perturbations of the Robin Laplacian in the strong coupling limit

Rayan Fahs

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Abstract

This paper is devoted to the asymptotic analysis of the eigenvalues of the Laplace operator with a strong magnetic field and Robin boundary condition on a smooth planar domain and with a negative boundary parameter. We study the singular limit when the Robin parameter tends to infinity which is equivalent to a semi-classical limit involving a small positive semi-classical parameter. The main result is a comparison between the spectrum of the Robin Laplacian with an effective operator defined on the boundary of the domain via the Born-Oppenheimer approximation. More precisely, the low-lying eigenvalue of the Robin Laplacian is approximated by the those of the effective operator. When the curvature has a unique non-degenerate maximum, we estimate the spectral gap and find that the magnetic field does not contribute to the three-term expansion of the eigenvalues. In the case of the disc domains, the eigenvalue asymptotics displays the contribution of the magnetic field explicitly.

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BibTeX RIS

Rayan Fahs. 2021-11-02. Magnetic perturbations of the Robin Laplacian in the strong coupling limit. https://arxiv.org/abs/2111.01416

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