Chiral phonons in polar LiNbO3
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Quasiparticles describe collective excitations in many-body systems, and their symmetry classification is of fundamental importance because they govern physical processes on various timescales, e.g., excited states, transport phenomena, and phase transitions. Recent studies have revealed that quasiparticles can possess chirality and that this degree of freedom leads to various important phenomena. Among them, chiral phonons have recently attracted significant interest because of their intrinsic magnetism, which non-trivially bridges the spin system and the lattice. Here, we directly prove the presence of chiral phonons in a prototypical polar crystal LiNbO3. Our demonstration adds a polar crystal in the showcase of materials hosting chiral phonons and, furthermore, creates a substantial potential in chiral phononics because of its expected in-situ switchable phonon chirality and associated control of phonon angular momentum.
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Cited by 3 Pith papers
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Antiferro-Chiral Phonons in $\mathcal{P}\mathcal{T}$-Symmetric Antiferromagnets
PT-symmetric antiferromagnets support antiferro-chiral phonons whose sublattice-staggered angular momentum couples to the Neel vector via molecular Berry curvature.
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Antiferro-Chiral Phonons in $\mathcal{P}\mathcal{T}$-Symmetric Antiferromagnets
PT-symmetric antiferromagnets support antiferro-chiral phonons with sublattice-staggered angular momentum that acts as a conjugate field to the Néel vector via Néel-locked Raman-infrared hybridization.
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Lattice excitations with finite polarization and magnetization
Multiferrons are defined as elementary excitations with both electric and magnetic character that tilt polarization, generate magnetization via dynamical multiferroicity, and carry quadrupole and octupole moments, as ...
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