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arXiv · 1904.07593

Spontaneous generation of spin current from the vacuum by strong electric fields

Xu-Guang Huang·Mamoru Matsuo·Hidetoshi Taya
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Abstract

We discuss spontaneous spin current generation from the vacuum by strong electric fields as a result of interplay between the Schwinger mechanism and a spin-orbit coupling. By considering a homogeneous slow strong electric field superimposed by a fast weak transverse electric field, we explicitly evaluate the vacuum expectation value of a spin current (the Bargmann-Wigner spin current) by numerically solving the Dirac equation. We show that a non-vanishing spin current polarized in the direction perpendicular to the electric fields flows mostly in the longitudinal direction. We also find that a relativistic effect due to the helicity conservation affects direction/polarization of spin current.

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Xu-Guang Huang, Mamoru Matsuo, Hidetoshi Taya. 2019-04-16. Spontaneous generation of spin current from the vacuum by strong electric fields. https://doi.org/10.1093/ptep/ptz112

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