Electric field control of phonon angular momentum in perovskite BaTiO${}_3$

Abstract

We find that in BaTiO${}_3$ the phonon angular momentum is dominantly pointing in directions perpendicular to the electrical polarization. Therefore, external electric field in ferroelectric BaTiO${}_3$ does not control only the direction of electrical polarization, but also the direction of phonon angular momentum. This finding opens up the possibility for electric-field control of physical phenomena that rely on phonon angular momentum. We construct an intuitive model, based on our first-principles calculations, that captures the origin of the relationship between phonon angular momentum and electric polarization.

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Cited by in corpus (2)

• Understanding the role of Hubbard corrections in the rhombohedral phase of BaTiO${}_3$
• Catalogue of chiral phonon materials