The orbital magneto-electric effect in insulators is traced to a steady-state dipole moment proportional to the quantum metric, generated by Zitterbewegung.
Orbital magnetization from interface reflections in a conductor with charge current
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abstract
We propose that a high-quality flat interface or boundary can serve as a long-range skew scatterer for charged quasiparticles in a metal. When an electric current flows parallel to the interface, the balance between clockwise and counterclockwise reflections is disrupted, leading to a net orbital magnetization. This magnetization is maximized at the interface and varies linearly in the direction perpendicular to it. We suggest that this effect can be detected using spatially resolved Kerr effect measurements at distances up to the electron phase coherence length from the interface. Unlike the orbital Hall and orbital Edelstein effects, the proposed phenomenon does not require inversion symmetry breaking in the bulk of the sample and is unrelated to Hall effect physics.
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Quantum geometry and dipolar dynamics in the orbital magneto-electric effect
The orbital magneto-electric effect in insulators is traced to a steady-state dipole moment proportional to the quantum metric, generated by Zitterbewegung.