Chiral phonon in the cubic system based on the Laves phase of Bi (K, Rb, Cs)
arXiv:2208.14041 · doi:10.1016/j.commatsci.2023.112545
Abstract
B (K, Rb, Cs) compounds crystallize in the cubic Laves phase (symmetry Fdm). The geometry of the crystal structure allows the realization of chiral phonons, which are associated with the circulation of atoms around their equilibrium positions. Due to the inversion symmetry and time reversal symmetry, total pseudo-angular momentum (PAM) of the system vanishes. We show that the doping of these system can lead to a new phase with symmetry Fm. New systems (KRbBi and RbCsBi) do not exhibit soft modes (are stable dynamically). Due to the inversion symmetry breaking, realized chiral phonon modes posses a non-zero total PAM. In both type of systems the chiral phonons are realized for the wavectors at the edge of the Brillouine zone. This study explores the possibility of chiral phonon engineering via doping, and predicts two new materials. Discussing the problem opens a new way to study the phonon Hall effect.
arXiv comment10 pages, 6 figures
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