Semiclassical defect measures of magnetic Laplacians on hyperbolic surfaces
[Mesures de défaut semi-classiques des laplaciens magnétiques sur les surfaces hyperboliques]
Journal de l’École polytechnique — Mathématiques, Tome 13 (2026), pp. 593-627

On a closed hyperbolic surface, we investigate semiclassical defect measures associated with the magnetic Laplacian in the presence of a constant magnetic field. Depending on the energy level where the eigenfunctions concentrate, three distinct dynamical regimes emerge. In the low-energy regime, we show that any invariant measure of the magnetic flow in phase space can be obtained as a semiclassical measure. At the critical energy level, we establish Quantum Unique Ergodicity, together with a quantitative rate of convergence of eigenfunctions to the Liouville measure. In the high-energy regime, we prove a Shnirelman-type result: a density-one subsequence of eigenfunctions becomes equidistributed with respect to the Liouville measure.

Sur une surface hyperbolique compacte, nous étudions les mesures de défaut semi-classiques associées au laplacien magnétique en présence d’un champ magnétique constant. Selon le niveau d’énergie où les fonctions propres se concentrent, trois régimes dynamiques distincts apparaissent. Dans le régime de basse énergie, nous montrons que toute mesure invariante du flot magnétique dans l’espace des phases peut être obtenue comme mesure semi-classique. Au niveau d’énergie critique, nous établissons l’unique ergodicité quantique, ainsi qu’un taux de convergence quantitatif des fonctions propres vers la mesure de Liouville. Dans le régime de haute énergie, nous démontrons un résultat de type Shnirelman : une sous-suite de densité $1$ des fonctions propres devient équidistribuée par rapport à la mesure de Liouville.

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DOI : 10.5802/jep.333
Classification : 35P20, 37D40, 58J51, 35A27, 81Q50
Keywords: Semiclassical measures, magnetic Laplacian, hyperbolic surfaces, quantum chaos
Mots-clés : Mesures semi-classiques, laplacien magnétique, surfaces hyperboliques, chaos quantique

Laurent Charles  1   ; Thibault Lefeuvre  2

1 Université de Paris and Sorbonne Université, CNRS, IMJ-PRG, F-75006 Paris, France
2 Université Paris-Saclay, Laboratoire de mathématiques d’Orsay, 91405 Orsay, France
Licence : CC-BY 4.0
Droits d'auteur : Les auteurs conservent leurs droits
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     title = {Semiclassical defect measures of {magnetic~Laplacians} on hyperbolic surfaces},
     journal = {Journal de l{\textquoteright}\'Ecole polytechnique {\textemdash} Math\'ematiques},
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Laurent Charles; Thibault Lefeuvre. Semiclassical defect measures of magnetic Laplacians on hyperbolic surfaces. Journal de l’École polytechnique — Mathématiques, Tome 13 (2026), pp. 593-627. doi: 10.5802/jep.333

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