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Quantum Hall states under conditions of vanishing Zeeman energy

机译：塞曼能量消失的情况下，量子霍尔状态

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摘要

We report on magnetotransport measurements of a two-dimensional electron gas confined in a Cd_(0.997)Mn_(0.003)Te quantum well structure under conditions of vanishing Zeeman energy. The electron Zeeman energy has been tuned via the s-d exchange interaction in order to probe different quantum Hall states associated with metallic and insulating phases. We have observed that reducing Zeeman energy to zero does not necessary imply the disappearing of quantum Hall states, i.e., a closing of the spin gap. The spin-gap value under vanishing Zeeman-energy conditions is shown to be dependent on the filling factor. Numerical simulations support a qualitative description of the experimental data presented in terms of a crossing or an avoided crossing of spin split Landau levels with same orbital quantum number N.
机译：我们报告了在消失的塞曼能的条件下，二维电子气在Cd_（0.997）Mn_（0.003）Te量子阱结构中的磁输运测量。电子塞曼能量已经通过s-d交换相互作用进行了调谐，以探测与金属和绝缘相相关的不同量子霍尔态。我们已经观察到，将塞曼能量降低到零并不一定意味着量子霍尔态的消失，即自旋间隙的减小。显示在消失的塞曼能条件下的自旋间隙值取决于填充因子。数值模拟支持对具有相同轨道量子数N的自旋分裂Landau能级的交叉或避免交叉表示的实验数据进行定性描述。

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  • 来源
    《Physical review》 |2010年第24期|p.245120.1-245120.10|共10页
  • 作者

    F. J. Teran; M. Potemski; D. K. Maude; T. Andrearczyk; J. Jaroszynski; T. Wojtowicz; G. Karczewski;

  • 作者单位

    Laboratoire National des Champs Magnetiques Inenses, CNRS-UJF-UPS-INSA, 38042 Grenoble, France,Instituto Madrilefio de Estudios Avanzados en Nanociencia, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain;

    Laboratoire National des Champs Magnetiques Inenses, CNRS-UJF-UPS-INSA, 38042 Grenoble, France;

    Laboratoire National des Champs Magnetiques Inenses, CNRS-UJF-UPS-INSA, 38042 Grenoble, France;

    Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland;

    Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland ,National High Magnetic Field Laboratory, Tallahassee, Florida 32306, USA;

    Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland;

    Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland;

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  • 正文语种 eng
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  • 关键词

    electron gas; fermi gas; quantum hall effects; magnetic semiconductors;

    机译：电子气费米气体量子霍尔效应磁性半导体;

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