ABSTRACT

In the present works, we numerically study the persistent current of a quantum ring systems in the presence of charged rods and impurities. Effects of inner ring radius, ring thickness, negatively and positively charged rods radial electric fields, charged rod position, donor and acceptor impurities, and their positions, on the persistent current have been thoroughly investigated. In addition, in order to study the effect of electron localisation strength around the impurity on the persistent current, we have used a screened impurity potential. We show that the delocalisation of the electron leads to increasing the persistent current. By using the mentioned geometry as well as the charged impurity and rods, the tuning of the persistent current, energy levels and the corresponding eigenfunctions is now possible.

摘要

在目前的工作中，我们数值研究了在带电棒和杂质存在下量子环系统的持续电流。内环半径、环厚度、带负电和正电棒径向电场、带电棒位置、施主和受主杂质及其位置对持续电流的影响已得到彻底研究。此外，为了研究杂质周围的电子定域强度对持续电流的影响，我们使用了屏蔽杂质电位。我们表明电子的离域导致持续电流增加。通过使用上述几何形状以及带电杂质和棒，现在可以调整持续电流、能级和相应的本征函数。