Light-induced Magnetization by Quantum Geometry

• URL: http://arxiv.org/abs/2601.09637v1
• Date: Wed, 14 Jan 2026 17:13:08 GMT
• Title: Light-induced Magnetization by Quantum Geometry
• Authors: Hiroki Yoshida, Takehito Yokoyama,
• Abstract summary: We propose a mechanism for the inverse Faraday and the inverse Cotton--Mouton effects arising from quantum geometry.<n>Within a semiclassical framework based on the Boltzmann transport theory, we establish a general formalism describing light-induced magnetization in electronic systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We propose a mechanism for the inverse Faraday and the inverse Cotton--Mouton effects arising from quantum geometry, characterized by the quantum metric quadrupole and the weighted quantum metric. Within a semiclassical framework based on the Boltzmann transport theory, we establish a general formalism describing light-induced magnetization in electronic systems as a second-order response to the electric field of light. Using continuum and tight-binding models, we discuss the symmetry constraints on these effects and estimate the magnitudes of the resulting magnetizations. Our results highlight a direct manifestation of quantum-geometric quantities in nonlinear magneto-optical responses and suggest a viable pathway for experimental detection.

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