Difference between angular momentum and pseudoangular momentum

Abstract

In condensed matter systems it is necessary to distinguish between the momentum of the constituents of the system and the pseudomomentum of quasiparticles. The same distinction is also valid for angular momentum and pseudoangular momentum. Based on Noether's theorem, we demonstrate that the recently discussed orbital angular momenta of phonons and magnons are pseudoangular momenta. This conceptual difference is important for a proper understanding of the transfer of angular momentum in condensed matter systems, especially in spintronics applications.

6 pages, 1 figure

References in corpus (7)

• Unveiling pseudospin and angular momentum in photonic graphene
• Orbital magnetic moments of phonons
• Spin Insulatronics
• Angular Momentum Conservation and Phonon Spin in Magnetic Insulators
• Orbital Magnetic Moment of Magnons
• Schroedinger Correspondence Applied to Crystals
• Effects of the dynamical magnetization state on spin transfer

Cited by in corpus (26)

• Chirality as Generalized Spin-Orbit Interaction in Spintronics
• Chiral Phonons with Giant Magnetic Moments in a Topological Crystalline Insulator
• Giant effective magnetic moments of chiral phonons from orbit-lattice coupling
• Weyl phonons in chiral crystals
• Electron magnetic moment of transient chiral phonons in KTaO${}_3$
• Elastic Spin and Orbital Angular Momenta
• Sum-frequency excitation of coherent magnons
• Observation of Phonon Angular Momentum
• Dynamic Magnetoelastic Boundary Conditions and the Pumping of Phonons
• Selective observation of enantiomeric chiral phonons in $\alpha$-quartz
• Momentum, angular momentum, and spin of waves in an isotropic collisionless plasma
• Universal features of canonical phonon angular momentum without time-reversal symmetry
• Chiral phonons entangled with multiple Hall effects and unified convention for pseudoangular momentum in 2D materials
• Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
• Structural chirality measurements and computation of handedness in periodic solids
• Electric field control of phonon angular momentum in perovskite BaTiO${}_3$
• Magnetic dipolar modes in magnon-polariton condensates
• Chiral Topological Phononic Quasiparticles in Enantiomeric Crystals SrSi${}_2$ and BaSi${}_2$
• Exact Results for the Orbital Angular Momentum of Magnons on Honeycomb Lattices
• Optically- and thermally-driven huge lattice orbital and spin angular momenta from spinning fullerenes
• A spin-rotation mechanism of Einstein-de Haas effect based on a ferromagnetic disk
• Divergent phonon angular momentum driven by temperature and strain
• Anomalous phonon magnetic moments
• Observation of angular momentum transfer among crystal lattice modes
• How chiral vibrations drive molecular rotation
• Field Theory of Linear Spin-Waves in Finite Textured Ferromagnets