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.
This physical ro- tation differs from a mere relabeling of material-frame components, which would change the local basis used to describe the same physical configuration
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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.