Sengupta Sanghita, Lhachemi M Nabil Y, Garate Ion
Département de physique, Institut quantique and Regroupement Québécois sur les Matériaux de Pointe, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.
Phys Rev Lett. 2020 Oct 2;125(14):146402. doi: 10.1103/PhysRevLett.125.146402.
The phonon magnetochiral effect consists of a nonreciprocity in the velocity or attenuation of acoustic waves when they propagate parallel and antiparallel to an external magnetic field. The first experimental observation of this effect in the bulk has been reported recently in a chiral magnet and ascribed to the hybridization between acoustic phonons and chiral magnons. Here, we predict a potentially measurable phonon magnetochiral effect of electronic origin in chiral Weyl semimetals. Caused by the Berry curvature and the orbital magnetic moment, this effect is enhanced for longitudinal phonons by the chiral anomaly.
声子磁手性效应是指声波在平行和反平行于外部磁场传播时，其速度或衰减存在非互易性。最近，在一种手性磁体中首次报道了该效应在体材料中的实验观测结果，并将其归因于声子与手性磁振子之间的杂化。在此，我们预测在手性外尔半金属中存在一种可能可测量的源于电子的声子磁手性效应。这种效应由贝里曲率和轨道磁矩引起，对于纵向声子，手性反常会增强该效应。
