LAUSR

Abstract The electronic structure and the persistent current of the hexagonal MoS2 quantum rings are investigated within the multi-orbital tight-binding formalism. It is shown that the degenerate energy levels split owing to spin-orbit coupling of Mo and S atoms, especially for the highest occupied state. The energy levels show the periodic oscillation with the increase of perpendicular magnetic flux. The spin-up electrons induced by magnetic flux flow clockwise around the rings resulting in paramagnetism. However, the spin-down electrons flow anticlockwise around the rings resulting in diamagnetism. Thus the hexagonal MoS2 quantum rings exhibit paramagnetic or diamagnetic effect, which is the result of competition of spin-up and spin down states.