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MA: Fachverband Magnetismus

MA 40: Focus Session: Chiral phonons and crystals coupled to magnetic order II

MA 40.8: Vortrag

Donnerstag, 12. März 2026, 12:00–12:15, HSZ/0002

Magnetic field induced pseudo angular momenta, chiral phonons, and anomalous EP interactions in some Weyl semimetals — Vladimir Gnezdilov¹, Florian Büscher², •Peter Lemmens², Angela Möller³, Dirk Wulferding⁴, Claudia Felser⁵, and Chandra Shekar⁵ — ¹ILTPE, Kharkiv, Ukraine — ²IPKM, TU-BS, Braunschweig — ³Dept. Chemistry, JGU, Mainz — ⁴Dept. Physics and Astr., Sejong Univ., Korea — ⁵MPI-CPfS, Dresden

Applying magnetic fields excite phonon chirality and induce angular momenta due to the time-reversal breaking [1]. This allows to study effects usually restricted to the boundary of the Brillouin zone. We show such results for several Weyl semimetals [2] with uncommon spin-phonon interactions and discuss novel possibilities for the transfer and interaction between the angular momenta of photons and phonons [3].

[1] T. Wang, H. Sun, X. Li, L. Zhang, Chiral Phonons: Prediction, Verification, and Application, Nano Lett. 24, 15, 4311 (2024).

[2] P. Sessi, et al., Handedness-dependent quasiparticle interference in the two enantiomers of the topological chiral semimetal PdGa, Nature Comm. 11, 3507 (2020).

[3] R. Rao, et al., Anomalous Raman scattering in layered AgCrP₂Se₆: Helical modes and excitation energy-dependent intensities, https://arxiv.org/abs/2501.17565 (2025).

Keywords: chiral phonons; circular polarization; time reversal breaking; electron phonon interaction