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  • Letter
  • Open Access

Electron magnetic moment of transient chiral phonons in KTaO3

R. Matthias Geilhufe1 and Wolfram Hergert2

  • 1Department of Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
  • 2Institute of Physics, Martin Luther University Halle-Wittenberg, D-06120 Halle, Germany

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Phys. Rev. B 107, L020406 – Published 18 January, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L020406

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. To explain these phenomena, we derive a coupling mechanism between the phonon angular momentum and the electron spin. This coupling introduces the transient level splitting of spin-up and spin-down channels and a resulting magnetization. We estimate this magnetization on the example of the lowest infrared active mode in the perovskite KTaO3. Our results show an electronic magnetic moment of ≈10−1µB per unit cell, depending on the doping level and electron temperature.

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Phys. Rev. B 107, L020406– Published 18 January, 2023
  • Received 18 May 2022
  • Revised 11 August 2022
  • Accepted 11 January 2023
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