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Angular Momentum Conservation and Phonon Spin in Magnetic Insulators

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arxiv 1912.06616 v2 pith:NNLWTL4G submitted 2019-12-13 cond-mat.mes-hall

Angular Momentum Conservation and Phonon Spin in Magnetic Insulators

Andreas R\"uckriegel , Simon Streib , Gerrit E. W. Bauer , Rembert A. Duine This is my paper
classification cond-mat.mes-hall
keywords spinangularmomentuminsulatorsmagneticmicroscopicphononaccessible
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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