A new continuum theory introduces a local SO(3) material frame to unify phonon displacement and rotational modes, recovering micropolar elasticity and identifying terms for chiral phonon splitting.
Lazar, The gauge theory of dislocations: a non- singular screw dislocation, Philosophical Magazine 89, 199 (2009)
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Generalized continuum theory of phonon angular momentum in crystals
A new continuum theory introduces a local SO(3) material frame to unify phonon displacement and rotational modes, recovering micropolar elasticity and identifying terms for chiral phonon splitting.