Effect of δ barrier on persistent current in a quantum ring with multiple arms
δ势垒对多臂量子环中持续电流的影响

A new model of quantum ring with multiple arms whose middle arm is curved was proposed in this article.This is an unequal arm quantum ring with a shortest upper arm and a longest lower arm.The results indicate that the persistent spin current shows nonperiodic vibration with the size of the semiconductor ring increasing when the total magnetic flux is zero.And it is related to the electrodes'magnetic moment direction as well as the tunneling electrons'spin orientation.The average persistent spin current in ...