Gauge theory of giant phonon magnetic moment in doped Dirac semimetals

作者：Wenqin Chen, Xiaowei Zhang, Ying Su, Ting Cao, Di Xiao, Shi‐Zeng Lin · 发表于：Physical review. B./Physical review. B · 年份：2025 · DOI：10.1103/physrevb.111.035126 · 被引用次数：6 · 研究领域：Topological Materials and Phenomena、Graphene research and applications、Quantum Mechanics and Non-Hermitian Physics

We develop a quantitative theory of phonon magnetic moment in doped Dirac semimetals. Our theory is based on an emergent gauge field approach to the electron-phonon coupling, applicable to gapless systems. We find that the magnetic moment is directly proportional to the electrical Hall conductivity through the phonon Hall viscosity. Our theory is combined with the first-principles calculations, allowing us to quantitatively implement it to realistic materials. Magnetic moments are found to be of the order of a Bohr magneton for Raman-active phonon modes in graphene and ${\text{Cd}}_{3}{\text{As}}_{2}$. Our results provide practical guidance for the dynamical generation of large magnetization in quantum materials.