Orbital Magnetic Moment of Magnons

Abstract

In experiments and applications usually the spin magnetic moment of magnons is considered. In this Paper we identify an additional degree of freedom of magnons: an \emph{orbital} magnetic moment brought about by spin-orbit coupling.Our microscopic theory uncovers that spin magnetization ${\vec{M}}^{\mathrm{S}}$ and orbital magnetization ${\vec{M}}^{\mathrm{O}}$ are independent quantities. They are not necessarily collinear; thus, even when the total spin moment is compensated due to antiferromagnetism (${\vec{M}}^{\mathrm{S}}=\vec{0}$), ${\vec{M}}^{\mathrm{O}}$ may be nonzero. This scenario of orbital weak ferromagnetism is realized in paradigmatic kagome antiferromagnets with Dzyaloshinskii-Moriya interaction. We demonstrate that magnets exhibiting a magnonic orbital moment are omnipresent and propose transport experiments for probing it.

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Cited by in corpus (25)

• Observation of the orbital Hall effect in a light metal Ti
• Orbitronics: Orbital Currents in Solids
• Catalog of Unconventional Magnons in Collinear Magnets
• Interaction-stabilized topological magnon insulator in ferromagnets
• Thermal Hall effect of magnons in collinear antiferromagnetic insulators: signatures of magnetic and topological phase transitions
• Difference between angular momentum and pseudoangular momentum
• Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator
• Reversal of Orbital Hall Conductivity and Emergence of Tunable Topological Quantum States in Orbital Hall Insulator
• Topological Hybrids of Magnons and Magnon Bound Pairs
• Interface transparency to orbital current
• Nonvolatile Magnonics in Bilayer Magnetic Insulators
• Generation of twisted magnons via spin-to-orbital angular momentum conversion
• Intrinsic Nernst effect of the magnon orbital moment in a honeycomb ferromagnet
• Sign Changes in Heat, Spin, and Orbital Magnon Transport Coefficients in Kitaev Ferromagnets
• Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
• Orbital Edelstein effect of electronic itinerant orbital motion at edges
• Exact Results for the Orbital Angular Momentum of Magnons on Honeycomb Lattices
• Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet
• Electric polarization induced by magnons and magnon Nernst effects
• Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets
• Spin Nernst and thermal Hall effects of topological triplons in quantum dimer magnets on the maple-leaf and star lattices
• Chiral magnon in ferromagnetic chiral crystals
• Proper Theory of Magnon Orbital Angular Momentum at Equilibrium
• Ferroelectric Switchable Topological Magnon Hall Effect in Type-I Multiferroics
• Orbital Hall effect from orbital magnetic moments of Bloch states: the role of a new correction term