Chiral phonon in the cubic system based on the Laves phase of $A$Bi$_{2}$ ($A=$K, Rb, Cs)

Surajit Basak; Przemysław Piekarz; Andrzej Ptok

doi:10.1016/j.commatsci.2023.112545

paper

Chiral phonon in the cubic system based on the Laves phase of $A$ Bi $_{2}$ ( $A =$ K, Rb, Cs)

arXiv:2208.14041 · doi:10.1016/j.commatsci.2023.112545

Abstract

$A$ B $_{2}$ ( $A =$ K, Rb, Cs) compounds crystallize in the cubic Laves phase (symmetry Fd $3 ˉ$ m). 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 F $4 ˉ 3$ m. New systems (KRbBi $_{4}$ and RbCsBi $_{4}$ ) 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.

10 pages, 6 figures

References in corpus (15)

Cited by in corpus (1)

Strong-coupling superconductivity of the Heusler-type compound ScAu2Al: Ab-initio studies

Chiral phonon in the cubic system based on the Laves phase of ABi2​ (A=K, Rb, Cs)

Abstract

References in corpus (15)

Cited by in corpus (1)

Chiral phonon in the cubic system based on the Laves phase of $A$ Bi $_{2}$ ( $A =$ K, Rb, Cs)