### Abstract

*b*varies. Namely, when the operators are self-adjoint, we show that their spectrum (as a set) is at least 1/2-Hölder continuous with respect to

*b*in the Hausdorff distance. Third, when the magnetic perturbation comes from a constant magnetic field we show that their spectral edges are Lipschitz continuous in

*b*. The same Lipschitz continuity holds true for spectral gap edges as long as the gaps do not close.

Original language | English |
---|---|

Journal | Journal of Pseudo-Differential Operators and Applications |

Volume | 10 |

Issue number | 2 |

Pages (from-to) | 307-336 |

Number of pages | 30 |

ISSN | 1662-9981 |

DOIs | |

Publication status | Published - 2019 |

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### Keywords

- Magnetic pseudodifferential operators
- Spectral estimates
- Generalized Hofstadter matrices

### Cite this

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**Magnetic pseudodifferential operators represented as generalized Hofstadter-like matrices.** / Cornean, Decebal Horia; Garde, Henrik; Støttrup, Benjamin; Sørensen, Kasper Studsgaard.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Magnetic pseudodifferential operators represented as generalized Hofstadter-like matrices

AU - Cornean, Decebal Horia

AU - Garde, Henrik

AU - Støttrup, Benjamin

AU - Sørensen, Kasper Studsgaard

PY - 2019

Y1 - 2019

N2 - First, we reconsider the magnetic pseudodifferential calculus and show that for a large class of non-decaying symbols, their corresponding magnetic pseudodifferential operators can be represented, up to a global gauge transform, as generalized Hofstadter-like, bounded matrices. As a by-product, we prove a Calderón-Vaillancourt type result. Second, we make use of this matrix representation and prove sharp results on the spectrum location when the magnetic field strength b varies. Namely, when the operators are self-adjoint, we show that their spectrum (as a set) is at least 1/2-Hölder continuous with respect to b in the Hausdorff distance. Third, when the magnetic perturbation comes from a constant magnetic field we show that their spectral edges are Lipschitz continuous in b. The same Lipschitz continuity holds true for spectral gap edges as long as the gaps do not close.

AB - First, we reconsider the magnetic pseudodifferential calculus and show that for a large class of non-decaying symbols, their corresponding magnetic pseudodifferential operators can be represented, up to a global gauge transform, as generalized Hofstadter-like, bounded matrices. As a by-product, we prove a Calderón-Vaillancourt type result. Second, we make use of this matrix representation and prove sharp results on the spectrum location when the magnetic field strength b varies. Namely, when the operators are self-adjoint, we show that their spectrum (as a set) is at least 1/2-Hölder continuous with respect to b in the Hausdorff distance. Third, when the magnetic perturbation comes from a constant magnetic field we show that their spectral edges are Lipschitz continuous in b. The same Lipschitz continuity holds true for spectral gap edges as long as the gaps do not close.

KW - Magnetic pseudodifferential operators

KW - Spectral estimates

KW - Generalized Hofstadter matrices

KW - Magnetic pseudodifferential operators

KW - Spectral estimates

KW - Generalized Hofstadter matrices

U2 - 10.1007/s11868-018-0271-y

DO - 10.1007/s11868-018-0271-y

M3 - Journal article

VL - 10

SP - 307

EP - 336

JO - Journal of Pseudo-Differential Operators and Applications

JF - Journal of Pseudo-Differential Operators and Applications

SN - 1662-9981

IS - 2

ER -