Theory of spin magnetization driven by chiral phonons

Abstract

We construct a general theory of spin magnetization driven by chiral phonons under an adiabatic process, in which atoms rotate around their equilibrium positions with a low phonon frequency. Here the spin magnetization originates from the modulated electronic states with spin-orbital coupling by atomic rotations. Under the adiabatic approximation, the time-dependent spin magnetization can be calculated by a Berry-phase method. In this paper, we focus on its time average, which is evaluated by assuming that the phonon displacement is small. As a result, the time average of the spin magnetization is concisely formulated in the form of the Berry curvature defined in the phonon-displacement space as an intrinsic property of atomic rotations. Our formula for spin magnetization reflects the chiral nature of phonons, and is convenient for $ab$ $initio$ calculations.

9 pages, 4 figures

References in corpus (23)

• Polarized phonons carry the missing angular momentum in femtosecond demagnetization
• Truly chiral phonons in α-HgS
• Orbital magnetic moments of phonons
• Chiral phonons probed by X rays
• Effects of mechanical rotation on spin currents
• Large effective magnetic fields from chiral phonons in rare-earth halides
• Phononic Switching of Magnetization by the Ultrafast Barnett Effect
• Single-Valley Engineering in Graphene Superlattices
• Chirality-Induced Selectivity of Phonon Angular Momenta in Chiral Quartz Crystals
• Chiral Phonon Induced Spin-Polarization
• Chiral Phonons with Giant Magnetic Moments in a Topological Crystalline Insulator
• Chiral phonons and pseudo-angular momentum in non-symmorphic systems
• Adiabatically Induced Orbital Magnetization
• Dynamically induced magnetism in KTaO${}_3$
• Giant effective magnetic moments of chiral phonons from orbit-lattice coupling
• Weyl phonons in chiral crystals
• Conversion between electron spin and microscopic atomic rotation
• Chirality-induced Phonon-Spin Conversion at an Interface
• Theory of Energy Dispersion of Chiral Phonon
• Chiral-phonon-induced current in helical crystals
• Electric field-induced nonreciprocal spin current due to chiral phonons in chiral-structure superconductors
• Conversion of chiral phonons into magnons in ferromagnets and antiferromagnets
• Light Driven Spontaneous Phonon Chirality and Magnetization in Paramagnets

Cited by in corpus (6)

• Theory of spin Seebeck effect activated by acoustic chiral phonons
• Cavity-induced coherent magnetization and polaritons in altermagnets
• Catalogue of chiral phonon materials
• Microscopic Theory of Chiral-Phonon-Induced Orbital Selectivity in Helical Crystals
• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
• Pseudo-chiral phonon splitting from octupolar magnetic order