Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 25: Focus Session: Chiral phonons and crystals coupled to magnetic order I
MA 25.4: Talk
Wednesday, March 11, 2026, 10:45–11:00, HSZ/0002
Rotational Umklapp scattering in chiral nonlinear phononics — •Yu-Chi Huang1, Carolina Paiva2, and Dominik Juraschek1 — 1Eindhoven University of Technology, Eindhoven, Netherlands — 2Tel Aviv University, Tel Aviv, Israel
Chiral phonons, circularly polarized lattice vibrations propagating perpendicular to their rotational plane, commonly arise in chiral materials and have attracted considerable attention in condensed matter physics lately. Due to n-fold rotational crystal symmetry, they enable rotational phonon-phonon Umklapp scattering through nonlinear phonon coupling. This process is the angular-momentum analog of the conventional Umklapp scattering conserving linear crystal momentum. Recent pump-probe experiments have measured the effect in Bi2Se3, and we here develop a general theory using α-quartz (α-SiO2) as an example. Our results offer insight into the fundamentals of angular momentum conservation in solids.
Keywords: chiral phonons; chirality; nonlinear phononics; terahertz; ultrafast