D-Wave Phonon Angular Momentum Texture in Altermagnets by Magnon-Phonon Hybridization

Abstract

In altermagnets, the magnon bands are anisotropically spin-split in reciprocal space without relativistic or dipolar spin-spin interactions. In this work, we theoretically study magnons and phonons coupled by spin-lattice interaction in a two-dimensional square-lattice d-wave altermagnet. We show that phonon-chirality-selective magnon-phonon hybridization can be caused by interfacial Dzyaloshinskii-Moriya interaction leading to the emergence of hybrid quasiparticles that possess finite phonon angular momentum. These hybrid quasiparticles are called magnon polarons and consist of spin-polarized magnons and chiral phonons. Their phonon angular momentum texture follows the d-wave character of the magnon spin texture opening up the possibility of phononic counterparts to the electronic response effects in altermagnets, such as a phonon angular momentum splitter effect, i.e., the generation of a transverse phonon angular momentum current induced by a temperature gradient -- the bosonic analog of the spin-splitter effect.

Published version

References in corpus (35)

• Anomalous Hall effect
• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
• Valley contrasting chiral phonons in monolayer hexagonal lattices
• Observation of spin splitting torque in a collinear antiferromagnet RuO2
• Topological chiral magnonic edge mode in a magnonic crystal
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Observation of spin-splitter torque in collinear antiferromagnetic RuO${}_2$
• Angular Momentum of Phonons and Einstein-de Haas Effect
• The Ultrafast Einstein-De Haas Effect
• Polarized phonons carry the missing angular momentum in femtosecond demagnetization
• Landau Theory of Altermagnetism
• Coherent long-range transfer of angular momentum between magnon Kittel modes by phonons
• Truly chiral phonons in α-HgS
• Orbital magnetic moments of phonons
• Thermal Hall Effect Induced by Magnon-Phonon Interactions
• Angular momentum in spin-phonon processes
• Advances in coherent coupling between magnons and acoustic phonons
• Chirality selective magnon-phonon hybridization and magnon-induced chiral phonons in a layered zigzag antiferromagnet
• Phonon angular momentum Hall effect
• Chirality-Induced Selectivity of Phonon Angular Momenta in Chiral Quartz Crystals
• Magnon Spin-Momentum Locking: Various Spin Vortices and Dirac Magnons in Noncollinear Antiferromagnets
• Angular Momentum Conservation and Phonon Spin in Magnetic Insulators
• Dynamic paramagnon-polarons in altermagnets
• Dzyaloshinskii-Moriya Induced Topological Magnon-Phonon Hybridization in 2D Antiferromagnetic Insulators with Tunable Chern Numbers
• Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
• Observation of Phonon Angular Momentum
• Classification of materials with phonon angular momentum and microscopic origin of angular momentum
• Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators
• Chiral phonons as dark matter detectors
• Rotationally invariant formulation of spin-lattice coupling in multi-scale modeling
• Non-linear anomalous Edelstein response at altermagnetic interfaces
• Generation of Phonons with Angular Momentum During Ultrafast Demagnetization
• Chiral magnon-polaron edge states in Heisenberg-Kitaev magnets
• Operator-based derivation of phonon modes and characterization of correlations for trapped ions at zero and finite temperature