Giant effective magnetic moments of chiral phonons from orbit-lattice coupling

Abstract

Circularly polarized lattice vibrations carry angular momentum and lead to magnetic responses in applied magnetic fields or when resonantly driven with ultrashort laser pulses. Recent measurements have found responses that are orders of magnitude larger than those calculated in prior theoretical studies. Here, we present a microscopic model for the effective magnetic moments of chiral phonons in magnetic materials that is able to reproduce the experimentally measured magnitudes and that allows us to make quantitative predictions for materials with giant magnetic responses using microscopic parameters. Our model is based on orbit-lattice couplings that hybridize optical phonons with orbital electronic transitions. We apply our model to two types of materials: $4f$ rare-earth halide paramagnets and $3d$ transition-metal oxide magnets. In both cases, we find that chiral phonons can carry giant effective magnetic moments of the order of a Bohr magneton, orders of magnitude larger than previous predictions.

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Cited by in corpus (26)

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• Magnetic order induced chiral phonons in a ferromagnetic Weyl semimetal
• Phonon-induced geometric chirality
• Phonon Inverse Faraday effect from electron-phonon coupling
• Theory of spin magnetization driven by chiral phonons
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• Gauge theory of giant phonon magnetic moment in doped Dirac semimetals
• Phonon Edelstein effect in chiral metals
• Simple THz phase retarder based on Mach-Zehnder interferometer for polarization control
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• Spin-spin interaction mediated by chiral phonons
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• Cavity-assisted magnetization switching in a quantum spin-phonon chain
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• Symmetry-guided catalogue of chiral phonon materials
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• General ab initio framework for electronic-order-induced lattice-dynamics symmetry breaking
• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
• $SU(N)$ spin-phonon simulations of Floquet dynamics in spin $S>1/2$ Mott insulators
• How chiral vibrations drive molecular rotation
• Supercurrent-induced phonon angular momentum
• Pseudo-chiral phonon splitting from octupolar magnetic order
• Frequency renormalization and its effects in nonlinear phononics with $Q_R{Q}_{IR}^2$-type coupling