标题： 汞$_{1-y}$锰$_{y}$碲量子阱中的量子反常霍尔效应 显示英文标题

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

摘要： 当二维电子气受到外加磁场作用时，通常可以观察到量子霍尔效应，从而使它们的量子态形成朗道能级。 在本工作中，我们预测一种新的现象，即量子反常霍尔效应，可以在Hg$_{1-y}$Mn$_{y}$Te量子阱中实现，而无需外加磁场和相关的朗道能级。 这种效应纯粹源于$Mn$原子的自旋极化，并且预测在量子阱厚度和$Mn$原子浓度的一定范围内，会出现量化霍尔电导。 这种效应使得自旋电子学器件中可以实现无耗散的电荷电流。 显示英文摘要

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.