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Anisotropic composite fermions and fractional quantum Hall effect

机译:各向异性复合费米子和分数量子霍尔效应

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We study the role of anisotropy on the transport properties of composite fermions near Landau level filling factor v = 1/2 in two-dimensional holes confined to a GaAs quantum well. By applying a parallel magnetic field, we tune the composite fermion Fermi sea anisotropy and monitor the relative change of the transport scattering time at v = 1/2 along the principal directions. Interpreted in a simple Drude model, our results suggest that the scattering time is longer along the longitudinal direction of the composite fermion Fermi sea. Furthermore, the measured energy gap for the fractional quantum Hall state at v = 2/3 decreases when anisotropy becomes significant. The decrease, however, might partly stem from the charge distribution becoming bilayerlike at very large parallel magnetic fields.
机译:我们研究了各向异性对限制在GaAs量子阱中的二维空穴中Landau能级填充因子v = 1/2附近的复合费米子传输特性的作用。通过施加平行磁场,我们对复合费米子费米海各向异性进行了调谐,并沿主方向监视了v = 1/2处的传输散射时间的相对变化。用简单的Drude模型解释,我们的结果表明,沿着复合费米子费米海的纵向方向的散射时间更长。此外,当各向异性变得显着时,分数量子霍尔状态在v = 2/3处测得的能隙减小。但是,这种降低可能部分是由于在非常大的平行磁场下电荷分布变成双层的。

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  • 来源
    《Physical review》 |2016年第19期|195436.1-195436.5|共5页
  • 作者单位

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

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