Using linear response and Biot-Savart calculations, the authors show that the spin-accumulation magnetic field of a QSH edge decays as 1/d^2, while the current field decays as 1/d, and estimate where NV magnetometry could resolve the spin-accumulation signal.
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Magnetic field Characterization of edge currents in quantum spin Hall insulators
Using linear response and Biot-Savart calculations, the authors show that the spin-accumulation magnetic field of a QSH edge decays as 1/d^2, while the current field decays as 1/d, and estimate where NV magnetometry could resolve the spin-accumulation signal.