Work supported in part by US Department of Energy contract DE-AC02-76SF00515. Quantum Anomalous Hall Effect in Hg1−yMnyTe Quantum Wells

نویسندگان

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

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 Hg1−yMnyTe 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.

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تاریخ انتشار 2008