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arXiv 1004.4425cond-mat.mes-hall
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金属-半导体混合结构中高迁移率载流子的高温自旋极化

High-temperature spin polarization of high-mobility charge carriers in hybrid metal-semiconductor structures

E. Z. Meilikhov, R. M. Farzetdinova

摘要:

我们考虑由铁磁金属、稀磁半导体和量子阱组成的平面结构的磁性(以混合异质结构Fe-Ga(Mn)As-InGaAs为例)。在平均场论的框架下,磁性杂质(Mn)与铁磁金属(Fe)通过量子阱中的导电沟道间接相互作用,导致铁磁金属(Fe)在磁性杂质(Mn)体系中感应的铁磁性显著放大。结果,高温铁磁性的出现导致量子阱中局部化的载流子(空穴)的自旋极化并保持其高迁移率。

英文摘要:

We consider magnetic properties of the planar structure consisting of a ferromagnetic metal, diluted magnetic semiconductor and the quantum well (by the example of the hybrid heterostructure Fe--Ga(Mn)As--InGaAs). In the framework of the mean-field theory, there is the significant amplification of the ferromagnetism induced by the ferromagnetic metal (Fe) in the system of magnetic impurities (Mn) due to their indirect interaction via the conductivity channel in the quantum well. As a result, the high-temperature ferromagnetism arises leading to the spin polarization of charge carriers (holes) localized in the quantum well and preserving their high mobility.

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