In a V-shaped 1D chain the nonmagnetic magnetoelectric response peaks near apex angle 0.6π because geometry induces an effective spin-orbit term whose angular factor sinθ sin(θ/2) matches Kubo-formula numerics.
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A Schwinger-Keldysh path integral formalism is developed for input-output theory, enabling computation of full output field coherence functions for nonlinear quantum systems.
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Shape dependence of Edelstein and magnetoelectric effects in the V-shaped model
In a V-shaped 1D chain the nonmagnetic magnetoelectric response peaks near apex angle 0.6π because geometry induces an effective spin-orbit term whose angular factor sinθ sin(θ/2) matches Kubo-formula numerics.