Intrinsic spin of elastic waves

@article{Long2018IntrinsicSO,
  title={Intrinsic spin of elastic waves},
  author={Yang Long and Jie Ren and Hong Chen},
  journal={Proceedings of the National Academy of Sciences},
  year={2018},
  volume={115},
  pages={9951 - 9955}
}
Significance Spin unveils the fundamental geometrical and topological properties of waves. Massive studies have shown that the circularly polarized transverse wave can carry nontrivial spin density and thus possess quantum spin Hall effect. However, the spin nature of the longitudinal wave still lacks research. Here, based on the elastic wave platform, we show that the longitudinal wave can carry unique spin angular momentum due to its special spin–orbit coupling, and, importantly, the mixed… 

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