Chiral phono-magnetism and spin-rotation coupling

ORAL · Invited

Abstract

High intensity THz lasers allow for the coherent excitation of individual phonon modes. The ultrafast control of emergent magnetism by means of phonons opens up new tuning mechanisms for functional materials. While theoretically predicted phonon magnetic moments are tiny, recent experiments hint towards a significant magnetization in various materials. I will give an introduction into chiral phono-magnetism and outline the current challenges in the field. Furthermore, I introduce a coupling mechanism between rotational degrees of freedom and the electron spin. This coupling introduces the transient level-splitting of spin-up and spin-down channels and a resulting magnetization.

[1] Geilhufe et al., Physical Review Research, 3, L022011, 2021

[2] Geilhufe, Physical Review Research, 4, L012004, 2022

[3] Geilhufe & Hergert, Physical Review B, 107, L020406, 2023

* We acknowledge support from the Swedish Research Council (VR starting Grant No. 2022-03350) and Chalmers University of Technology, via the department of Physics, the area of advance Nano, and the area of advance Materials. Furthermore, we acknowledge computational resources from the Swedish National Infrastructure for Computing (SNIC) via the National Supercomputer Centre (NSC).

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Publication: [1] Geilhufe et al., Physical Review Research, 3, L022011, 2021
[2] Geilhufe, Physical Review Research, 4, L012004, 2022
[3] Geilhufe & Hergert, Physical Review B, 107, L020406, 2023

Presenters

  • R. Matthias Geilhufe

    Chalmers University, Chalmers Univ of Tech

Authors

  • R. Matthias Geilhufe

    Chalmers University, Chalmers Univ of Tech