自旋对磁量子反点能谱和磁电导的影响

SPIN EFFECT ON ENERGY SPECTRUM AND MAGNETOCONDUCTANCE IN A MAGNETIC QUANTUM ANTIDOT

利用分区求解单粒子薛定谔方程的方法 ,研究了电子自旋对磁量子反点中电子能级和磁电导的影响 .结果表明 ,电子自旋与非均匀磁场的相互作用使电子能级发生劈裂 ,其特征与均匀磁场中电子自旋引起的劈裂显著不同 ,磁量子反点中能级的劈裂与角动量量子数密切相关 .电子共振隧穿到磁边缘态 ,导致了磁电导随磁场的非周期性振荡 .考虑电子自旋与不考虑电子自旋相比 ,磁电导谱中谷的数目增多且深度减小 .

By solving the single particle Shrdinger equation in different regions,we have discussed the spin effect on the energy levels of electron and the magnetoconductance in the magnetic quantum antidot. It is shown that the interaction of spin and the magnetic field results in the split of the energy levels. The splitting features are different from those in homogeneous magnetic field,i.e.the extent of the splitting is closely related to the angular momentum quantum number. Electron resonant tunneling to the magnetic edge states gives rise to the oscillations of the magnetoconductance. And spin\|assisting magnetoconductance is quite different from that in the case where electron spin is ignored.There are more and shallower dips in the magnetoconductance spectrum for the former case.