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Spin and orbital angular momenta of acoustic beams

Bliokh, Konstantin; Nori, Franco


We analyze spin and orbital angular momenta in monochromatic acoustic wave fields in a homogeneous medium. Despite being purely longitudinal (curl-free), inhomogeneous acoustic waves generically possess nonzero spin angular momentum density caused by the local rotation of the vector velocity field. We show that the integral spin of a localized acoustic wave vanishes in agreement with the spin-0 nature of longitudinal phonons. We also show that the helicity or chirality density vanishes...[Show more]

CollectionsANU Research Publications
Date published: 2019
Type: Journal article
Source: Physical Review B
DOI: 10.1103/PhysRevB.99.174310
Access Rights: Open Access


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