Spin current backflow is unexpectedly strong in unidirectional monochromatic EM waves and correlates with negative local wavenumbers, intensity zeros, and vortices.
Canonical energy backflow in airy beams.Journal of the Optical Society of America B, 43(1):128–134
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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.