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- Title
Spontaneous generation of spin current from the vacuum by strong electric fields.
- Authors
Huang, Xu-Guang; Matsuo, Mamoru; Taya, Hidetoshi
- 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 helicity conservation affects the direction/polarization of a spin current.
- Subjects
ELECTRIC fields; SPIN-orbit interactions; DIRAC equation; HELICITY of nuclear particles; FRANZ-Keldysh effect
- Publication
Progress of Theoretical & Experimental Physics: PTEP, 2019, Vol 2019, Issue 11, pN.PAG
- ISSN
2050-3911
- Publication type
Article