PT-symmetric antiferromagnets support antiferro-chiral phonons whose sublattice-staggered angular momentum couples to the Neel vector via molecular Berry curvature.
Streib, Difference between angular momentum and pseudoangular momentum, Phys
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A group-theory approach labels BSE excitons with irreducible representations and total crystal angular momentum to derive selection rules and conservation laws, demonstrated in three materials.
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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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Symmetries of excitons
A group-theory approach labels BSE excitons with irreducible representations and total crystal angular momentum to derive selection rules and conservation laws, demonstrated in three materials.