Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Focus Session: Chiral phonons and crystals coupled to magnetic order I

MA 25.5: Hauptvortrag

Mittwoch, 11. März 2026, 11:15–11:45, HSZ/0002

Observation and control of chiral phonons in non-centrosymmetric materials — •Hiroki Ueda — Paul Scherrer Institute, Villigen, Switzerland

The field of chiral phonons has rapidly grown with the emergence of various intriguing phenomena, including magnetism, transport, and light-matter interactions. Chiral phonons are rotational phonon modes propagating out of the rotational plane, breaking improper rotational symmetry. I will present direct demonstrations of chiral phonons in chiral crystal α-SiO2 and polar crystals LiNbO3 and BaTiO3 using resonant inelastic X-ray scattering (RIXS) with circularly polarized X-rays. Angular momentum transfer between circularly polarized photons and chiral phonons imposes the selection rule in the RIXS process, enabling observation of chiral phonons through circular dichroism in phonon excitation peaks. Furthermore, in BaTiO3, we demonstrate in situ electrical switching of phonon chirality, opening pathways for dynamic control of chiral phononic properties.

Keywords: Chiral phonons; Resonant inelastic X-ray scattering