Transverse spinning of unpolarized light

@article{Eismann2020TransverseSO,
  title={Transverse spinning of unpolarized light},
  author={Jorg S. Eismann and Luke H Nicholls and Diane J. Roth and Miguel A. Alonso and Peter Banzer and Francisco J. Rodr'iguez-Fortuno and Anatoly V. Zayats and Franco Nori and Konstantin Y. Bliokh},
  journal={Nature Photonics},
  year={2020},
  volume={15},
  pages={156-161}
}
It is well known that the spin angular momentum of light, and therefore that of photons, is directly related to their circular polarization. Naturally, for totally unpolarized light, polarization is undefined and the spin vanishes. However, for non-paraxial light, the recently discovered transverse spin component, orthogonal to the main propagation direction, is largely independent of the polarization state of the wave. Here, we demonstrate, both theoretically and experimentally, that this… 

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