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TT: Fachverband Tiefe Temperaturen

TT 13: Focus Session: Magnetic Phenomena from Phonon Chirality and Angular Momentum II (joint session MA/TT)

TT 13.5: Talk

Tuesday, March 18, 2025, 10:30–10:45, H16

Phonon Inverse Faraday effect from electron-phonon coupling — •Natalia Shabala and Matthias Geilhufe — Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden

The phonon inverse Faraday effect describes the emergence of a DC magnetization due to circularly polarized phonons. From time-dependent second order perturbation theory and electron-phonon coupling we develop a microscopic formalism for phonon inverse Faraday effect. We arrive at a general and material-independent equation [1]. Using this equation for ferroelectric soft mode in SrTiO₃ gives an estimate of effective magnetic field which is consistent with recent experiments [2]. Hence, our approach 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.

[1] N. Shabala and R. M. Geilhufe, Accepted to PRL, arXiv:2405.09538, 2024

[2] M. Basini et al., Nature 628, 534 (2024)

Keywords: axial phonons; magnetism; electron-phonon coupling; phono-magnetic effects; chiral phonons