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On May 20, it was reported that chiral phonons, lattice vibrations with non-zero angular momentum, primarily exist in non-centrosymmetric crystals such as chiral crystals like quartz, a-HgS, Te, and monolayer transition metal dichalcogenides like WSe2. When time-reversal symmetry is broken, an external magnetic field can induce significant Zeeman splitting of chiral phonons in specific materials. Previously, this phenomenon has been observed in various systems, including PbTe semiconductors, Cd3As2 Dirac semimetals, 4f rare-earth halide paramagnets like CeF3 and CeCl3, and 3d transition metal oxide antiferromagnets like Fe2Mo3O8 and CoTiO3. These studies have revealed that the magnetic moments carried by phonons are significantly larger than traditionally anticipated from ions.
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