Spin current backflow is unexpectedly strong in unidirectional monochromatic EM waves and correlates with negative local wavenumbers, intensity zeros, and vortices.
Backward energy flow in simple four-wave electromagnetic fields.European Journal of Physics, 42(5):055301
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Orbital and spin current density backflow in unidirectional monochromatic electromagnetic fields in vacuum
Spin current backflow is unexpectedly strong in unidirectional monochromatic EM waves and correlates with negative local wavenumbers, intensity zeros, and vortices.