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.

arXiv comment6 pages, 1 figure

References in corpus (26)

• Valley contrasting chiral phonons in monolayer hexagonal lattices
• Momentum of an electromagnetic wave in dielectric media
• Angular Momentum of Phonons and Einstein-de Haas Effect
• Unveiling pseudospin and angular momentum in photonic graphene
• Coherent long-range transfer of angular momentum between magnon Kittel modes by phonons
• Orbital magnetic moments of phonons
• Spin Insulatronics
• Dissecting spin-phonon equilibration in ferrimagnetic insulators by ultrafast lattice excitation
• Spin and the Honeycomb Lattice: Lessons from Graphene
• Angular momentum in spin-phonon processes
• Phono-magnetic analogs to opto-magnetic effects
• Damping of magnetization dynamics by phonon pumping
• Twisted magnon as a magnetic tweezer
• Long-Range Phonon Spin Transport in Ferromagnet-Nonmagnetic Insulator Heterostructures
• Photonic orbital angular momentum transfer and magnetic skyrmion rotation
• Angular and Linear Momentum of Excited Ferromagnets
• Angular Momentum Conservation and Phonon Spin in Magnetic Insulators
• Unidirectional Pumping of Phonons by Magnetization Dynamics
• Orbital Magnetic Moment of Magnons
• Quantum many-body dynamics of the Einstein-de Haas effect
• Conserved momenta of a ferromagnetic soliton
• Energy-momentum tensor of a ferromagnet
• How Electrons Spin
• Energy and momentum conservation in spin transfer
• Schroedinger Correspondence Applied to Crystals
• Effects of the dynamical magnetization state on spin transfer

Cited by in corpus (27)

• Giant effective magnetic fields from optically driven chiral phonons in 4$f$ paramagnets
• 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
• Selective observation of enantiomeric chiral phonons in $\alpha$-quartz
• Dynamic Magnetoelastic Boundary Conditions and the Pumping of Phonons
• 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
• Structural chirality measurements and computation of handedness in periodic solids
• Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
• Electric field control of phonon angular momentum in perovskite BaTiO${}_3$
• Magnetic dipolar modes in magnon-polariton condensates
• 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
• Chiral Topological Phononic Quasiparticles in Enantiomeric Crystals SrSi${}_2$ and BaSi${}_2$
• 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