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arXiv 0802.2711cond-mat.mes-hall
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Hg $_{1-y}$ Mn $_{y}$ Te量子阱中的量子反常霍尔效应

Quantum Anomalous Hall Effect in Hg$_{1-y}$Mn$_{y}$Te Quantum Wells

Chao-Xing Liu, Xiao-Liang Qi, Xi Dai, Zhong Fang, Shou-Cheng Zhang

摘要:

当二维电子气受到外加磁场作用时,通常会观察到量子霍尔效应,使它们的量子态形成朗道能级。在这项工作中,我们预测一个新的现象,量子反常霍尔效应,可以实现在Hg $_{1-y}$ Mn $_{y}$ Te量子阱,没有外部磁场和相关的朗道能级。这种效应纯粹是由$Mn$原子的自旋极化引起的,并且预测了量子阱厚度和$Mn$原子浓度范围内的量子化霍尔电导。这种效应使得自旋电子器件中的电荷电流无耗散。

英文摘要:

The quantum Hall effect is usually observed when the two-dimensional electron gas is subjected to an external magnetic field, so that their quantum states form Landau levels. In this work we predict that a new phenomenon, the quantum anomalous Hall effect, can be realized in Hg$_{1-y}$Mn$_{y}$Te quantum wells, without the external magnetic field and the associated Landau levels. This effect arises purely from the spin polarization of the $Mn$ atoms, and the quantized Hall conductance is predicted for a range of quantum well thickness and the concentration of the $Mn$ atoms. This effect enables dissipationless charge current in spintronics devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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