磁台阶势垒结构中二维电子气的自旋极化输运

运用散射矩阵方法，研究了台阶磁势垒量子结构中二维电子气的隧穿输运性质.结果表明：在零偏压下，电子传输概率的自旋极化曲线随入射能量的增加而振荡衰减；随着磁台阶数的增加，电子传输概率的自旋极化度最大值减小，同时电子传输概率的自旋极化度振荡衰减也越来越慢；随着磁台阶的总宽度增加，电子传输概率的自旋极化曲线出现更明显的振荡，电子隧穿磁台阶势垒表现出明显的量子尺寸效应；在偏置电压的作用下，电子传输概率的自旋极化度在宽广的入射能量区出现明显的振荡增大，电子隧穿磁台阶势垒表现出更明显的自旋过滤效应.关键词：磁台阶势垒自旋极化自旋过滤

Spin polarized transport of two-dimensional electron gas through step-magnetic barrier structure

By using the scattering matrix method, the properties of two-dimensional electron gas spin polarized transport through step-magnetic barrier structure at different bias voltage are investigated. The results show that (i) the degree of spin polarization is cyclically reducing if the incidence energy increases at zero bias voltage, and (ii) it is reduced slower and the maximum of spin polarization decreases when the number of steps increase in this structure, and (iii) it is enhanced significantly in a wider energy range under applied bias voltage, and more distinct spin-filtering properties are observed in the step-magnetic barriers.