Phonon Inverse Faraday effect from electron-phonon coupling

Abstract

The phonon inverse Faraday effect describes the emergence of a DC magnetization due to circularly polarized phonons. In this work we present a microscopic formalism for the phonon inverse Faraday effect. The formalism is based on time-dependent second order perturbation theory and electron phonon coupling. While our final equation is general and material independent, we provide estimates for the effective magnetic field expected for the ferroelectric soft mode in the oxide perovskite SrTiO${}_3$. Our estimates are consistent with recent experiments showing a huge magnetization after a coherent excitation of circularly polarized phonons with THz laser light. Hence, the theoretical approach presented here is promising for shedding light into the microscopic mechanism of angular momentum transfer between ionic and electronic angular momentum, which is expected to play a central role in the phononic manipulation of magnetism.

Main text: 5 pages, 3 figures and supplementary materials

References in corpus (14)

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Cited by in corpus (8)

• Chiral phonons in polar LiNbO3
• Simple THz phase retarder based on Mach-Zehnder interferometer for polarization control
• Quantum Nonlinear Acoustic Hall Effect and Inverse Acoustic Faraday Effect in Dirac Insulators
• Anomalous phonon magnetic moments
• Lattice excitations with finite polarization and magnetization
• Observation of angular momentum transfer among crystal lattice modes
• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
• Pseudo-chiral phonon splitting from octupolar magnetic order