Nature CommunicationsRevealing intrinsic 3D spin angular momentum of evanescent acoustic phonons on a single-crystal surface using ultrafast optoacousticsYi HeGuojie LuoHoon SohnOsamu MatsudaOliver B. WrightZhongqing Su2026-03-05Full textDOI https://doi.org/10.1038/s41467-026-70019-9