Angular momentum conservation and phonon spin in magnetic insulators
Andreas Rückriegel (Universiteit Utrecht)
Simon Streib (Kavli institute of nanoscience Delft, TU Delft - QN/Bauer Group)
Gerrit E.W. Bauer (TU Delft - QN/Bauer Group, Kavli institute of nanoscience Delft, Tohoku University)
Rembert A. Duine (Norwegian University of Science and Technology (NTNU), Universiteit Utrecht, Eindhoven University of Technology)
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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.