Spin and orbital angular momenta of acoustic beams
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]
|Collections||ANU Research Publications|
|Source:||Physical Review B|
|Access Rights:||Open Access|
|01_Bliokh_Spin_and_orbital_angular_2019.pdf||1.87 MB||Adobe PDF|
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