Non-vanishing Berry phase in chiral insulators

摘要: The binary compounds FeSi, RuSi, and OsSi are chiral insulators crystallizing in the space group P213 which is cubic. By means of ab initio calculations we find for these a non-vanishing electronic Berry phase, sign depends on handedness crystal. There thus possibility that phase signals existence macroscopic electric polarization due to electrons. We show this indeed so if small external magnetic field applied the?[111] direction. oscillatory possesses signature distinguishes Our findings add discussion topological classifications significant spintronics applications, particular, deeper understanding skyrmions insulators.