Observation of interplay between phonon chirality and electronic band topology.

ABSTRACT: The recently demonstrated chiral modes of lattice motion carry angular momentum and therefore directly couple to magnetic fields. Notably, their magnetic moments are predicted to be strongly influenced by electronic contributions. Here, we have studied the magnetic response of transverse optical phonons in a set of Pb_1-xSn_xTe films, which is a topological crystalline insulator for x > 0.32 and has a ferroelectric transition at an x-dependent critical temperature. Polarization-dependent terahertz magnetospectroscopy measurements revealed Zeeman splittings and diamagnetic shifts, demonstrating a large phonon magnetic moment. Films in the topological phase exhibited phonon magnetic moment values that were larger than those in the topologically

SUBMITTER: Hernandez FGG 

PROVIDER: S-EPMC10848715 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature