Elastic Spin and Orbital Angular Momenta
arXiv:2204.13037 · doi:10.1103/PhysRevLett.129.204303
Abstract
Motivated by recent theoretical and experimental interest in the spin and orbital angular momenta of elastic waves, we revisit canonical wave momentum, spin, and orbital angular momentum in isotropic elastic media. We show that these quantities are described by simple universal expressions, which differ from the results of [G. J. Chaplain et al., Phys. Rev. Lett. 128, 064301 (2022)] and do not require separation of the longitudinal and transverse parts of the wavefield. For cylindrical elastic modes, the normalized z-component of the total (spin+orbital) angular momentum is quantized and equals the azimuthal quantum number of the mode, while the orbital and spin parts are not quantized due to the spin-orbit geometric-phase effects. In contrast to the claims of the above article, longitudinal, transverse, and `hybrid' contributions to the angular momenta are equally important and cannot be neglected. As another application of the general formalism, we calculate the transverse spin angular momentum of a surface Rayleigh wave.
arXiv comment5 pages, to appear in Phys. Rev. Lett
References in corpus (26)
- Spin-orbit interactions of light
- Chiral Quantum Optics
- Transverse and longitudinal angular momenta of light
- Quantum spin Hall effect of light
- Chiral nanophotonic waveguide interface based on spin-orbit coupling of light
- Extraordinary momentum and spin in evanescent waves
- Dual electromagnetism: Helicity, spin, momentum, and angular momentum
- Universal spin-momentum locking of evanescent waves
- Angular Momentum of Phonons and Einstein-de Haas Effect
- Angular Momenta and Spin-Orbit Interaction of Nonparaxial Light in Free Space
- Optical Momentum, Spin, and Angular Momentum in Dispersive Media
- Quantum Spin of Elastic Wave
- Spin and orbital angular momenta of acoustic beams
- Observation of acoustic spin
- Geometric phases in 2D and 3D polarized fields: geometrical, dynamical, and topological aspects
- Acoustic Radiation Force and Torque on Small Particles as Measures of the Canonical Momentum and Spin Densities
- Transverse spin and surface waves in acoustic metamaterials
- Angular momenta, helicity, and other properties of dielectric-fiber and metallic-wire modes
- Topological transport of sound mediated by spin-redirection geometric phase
- Field-theory spin and momentum in water waves
- Acoustic versus electromagnetic field theory: scalar, vector, spinor representations and the emergence of acoustic spin
- Spin-orbit interactions of transverse sound
- Difference between angular momentum and pseudoangular momentum
- Far-field and near-field directionality in acoustic scattering
- Momentum, angular momentum, and spin of waves in an isotropic collisionless plasma
- Acoustic vortex beams in synthetic magnetic fields
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- Quantitative optical imaging method for surface acoustic waves using optical path modulation
- Momentum, spin, and orbital angular momentum of electromagnetic, acoustic, and water waves
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