Giant effective magnetic moments of chiral phonons from orbit-lattice coupling

• DOI: 10.48550/arxiv.2306.11630
• Publication Date: 2023-01-01
• Authors: Swati Chaudhary; Dominik M. Juraschek; Martin Rodriguez-...; Gregory A. Fiete
• Keywords: Bohr magneton; Bohr model; Lattice (music)

Circularly polarized lattice vibrations carry angular momentum and lead to magnetic responses in applied fields or when resonantly driven with ultrashort laser pulses. Recent measurements have found that are orders of magnitude larger than those calculated prior theoretical studies. Here, we present a microscopic model for the effective moments chiral phonons materials is able reproduce experimentally measured magnitudes allows us make quantitative predictions giant using parameters. Our based on orbit-lattice couplings hybridize optical orbital electronic transitions. We apply our two types materials: $4f$ rare-earth halide paramagnets $3d$ transition-metal oxide magnets. In both cases, find can order Bohr magneton, previous predictions.