Angular momentum conservation and phonon spin in magnetic insulators

Journal article (2020)

Authors

Andreas Rückriegel Universiteit Utrecht
S.D. Streib QN/Bauer Group - AS , Kavli institute of nanoscience Delft
G.E. Bauer Tohoku University, Kavli institute of nanoscience Delft, QN/Bauer Group - AS
Rembert A. Duine Eindhoven University of Technology, Norwegian University of Science and Technology (NTNU), Universiteit Utrecht
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2020 Andreas Rückriegel, S.D. Streib, G.E. Bauer, Rembert A. Duine
DOI: https://doi.org/10.1103/PhysRevB.101.104402
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Published Date

2020

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

We develop a microscopic theory of spin-lattice interactions in magnetic insulators, separating rigid-body rotations and the internal angular momentum, or spin, of the phonons, while conserving the total angular momentum. In the low-energy limit, the microscopic couplings are mapped onto experimentally accessible magnetoelastic constants. We show that the transient phonon spin contribution of the excited system can dominate over the magnon spin, leading to nontrivial Einstein-de Haas physics.

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