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arXiv 0705.0237cond-mat.mes-hallcond-mat.mtrl-sci
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II-VI磁共振隧穿器件中的自旋极化输运

Spin-polarized transport in II-VI magnetic resonant tunneling devices

David Sanchez, Charles Gould, Georg Schmidt, Laurens W. Molenkamp

摘要:

我们研究了通过含有稀磁杂质的II-VI族半导体共振隧穿结构的电子输运。由于传导电子与杂质之间的交换作用,在中等低的磁场中会产生巨大的塞曼分裂。因此,当量子阱被磁性掺杂时,电流-电压特性示出对应于每个自旋通道的输运的两个峰。这种行为是实验观察到的,可以用一个简单的隧道模型再现。因此,该模型允许分析其他配置。首先,我们进一步增加磁场,这导致从引线注入的电子电流的自旋极化,从而引起电流幅度的相对变化。我们证明,自旋极化的发射极可以确定从这样的变化。此外,在磁掺杂注入器的情况下,我们的模型示出了峰值振幅的大幅增加和随着外场的增加而向更高电压的共振的移位。我们发现这种效应是由巨塞曼分裂、三维入射分布和宽共振线宽共同作用的结果。

英文摘要:

We investigate electronic transport through II-VI semiconductor resonant tunneling structures containing diluted magnetic impurities. Due to the exchange interaction between the conduction electrons and the impurities, there arises a giant Zeeman splitting in the presence of a moderately low magnetic field. As a consequence, when the quantum well is magnetically doped the current-voltage characteristics shows two peaks corresponding to transport for each spin channel. This behavior is experimentally observed and can be reproduced with a simple tunneling model. The model thus allows to analyze other configurations. First, we further increase the magnetic field, which leads to a spin polarization of the electronic current injected from the leads, thus giving rise to a relative change in the current amplitude. We demonstrate that the spin polarization in the emitter can be determined from such a change. Furthermore, in the case of a magnetically doped injector our model shows a large increase in peak amplitude and a shift of the resonance to higher voltages as the external field increases. We find that this effect arises from a combination of giant Zeeman splitting, 3-D incident distribution and broad resonance linewidth.

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