Electric field control of phonon angular momentum in BaTiO3

ORAL

Abstract

We studied the angular momentum of phonons in BaTiO3 from first principles. We find that in the tetragonal phase of BaTiO3 the average phonon angular momentum is significantly larger in directions perpendicular to polarization than parallel. Furthermore, there is additional anisotropy within the plane perpendicular to polarization. We analyze the interatomic force constants and build a simple effective model to reveal the origin of the anisotropies. Finally, we suggest experiments using BaTiO3 as an electric field controllable phonon angular momentum reservoir.

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This work was supported by grant NSF DMR-1848074.

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Presenters

  • Kevin Moseni

    • University of California, Riverside

Authors

  • Kevin Moseni

    • University of California, Riverside

  • Richard Wilson

    • University of California, Riverside
    • Mechanical Engineering, University of California, Riverside

  • Sinisa Coh

    • University of California, Riverside
    • Mechanical Engineering, University of California, Riverside