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arXiv · 2605.17462

Geometry-Driven Nonlinear Orbital Magnetoelectric Effect

Jinxiong Jia·Zhenhua Qiao·Jian Wang
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Abstract

We propose a nonlinear orbital magnetoelectric effect, which generates orbital magnetization quadratically in centrosymmetric materials where the linear orbital magnetoelectric effect is strictly forbidden. Using extended semiclassical formulation, we derive a gauge-invariant microscopic theory that separates intrinsic and extrinsic contributions and establishes their distinct dependence on the relaxation time, providing an experimental discriminator. In two-dimensional systems the nonlinear response is far less constrained by out-of-plane rotational symmetries than the linear orbital magnetoelectric effect, substantially enlarging the materials platform. Microscopically, the dominant contributions are governed by a Hermitian-connection structure. Finally, we estimate that the magnitude of the nonlinear orbital magnetoelectric effect lies within the sensitivity of state-of-the-art magneto-optical Kerr measurements.

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Jinxiong Jia, Zhenhua Qiao, Jian Wang. 2026-05-17. Geometry-Driven Nonlinear Orbital Magnetoelectric Effect. https://arxiv.org/abs/2605.17462

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