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arXiv · 2611.05950

Magnetic Bloch eigenvalue problems in nonuniform periodic magnetic fields: a Fourier-finite difference approach

Xueyang Li·Yuanwei Lai
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Abstract

We study magnetic Bloch eigenvalue problems for two-dimensional magnetic Schrödinger operators with nonuniform periodic magnetic fields and periodic scalar potentials, and develop a hybrid Fourier-finite difference discretization. A Landau-type gauge is constructed by solving a periodic Poisson equation. Under the integer magnetic flux condition, the magnetic Bloch boundary conditions are incorporated through shifts of Fourier-mode indices. The method combines link-variable-based covariant central differences in the $x$-direction with a Fourier pseudospectral discretization in the $y$-direction, yielding a Hermitian discrete Hamiltonian. The resulting eigenvalue problems are solved using a LOBPCG method. Under appropriate regularity assumptions, we establish a fully discrete consistency residual estimate of order $O(h_1^2+N_2^{-s})$. With suitable spectral separation and eigenspace dimension-preserving conditions, error estimates of the same order are derived for isolated eigenvalues and their associated eigenspaces. Numerical experiments show second-order convergence in the finite difference direction and rapid error reduction with increasing Fourier resolution, and illustrate band degeneracies and eigenstate distributions in nonuniform periodic magnetic fields.

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Xueyang Li, Yuanwei Lai. 2026-11-04. Magnetic Bloch eigenvalue problems in nonuniform periodic magnetic fields: a Fourier-finite difference approach. https://arxiv.org/abs/2611.05950

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