Angular momentum conservation and phonon spin in magnetic insulators
Andreas Rückriegel, Simon Streib, G. Bauer, R. A. Duine
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.
Topics & Concepts
PhysicsAngular momentumMagnonPhononCondensed matter physicsAngular momentum couplingTotal angular momentum quantum numberSpin (aerodynamics)Excited stateOrbital angular momentum of lightSpin waveAngular momentum operatorAngular momentum of lightQuantum mechanicsFerromagnetismThermodynamicsMagnetic properties of thin filmsMagnetic and transport properties of perovskites and related materialsPhysics of Superconductivity and Magnetism