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Ultra-low temperature studies of the even denominator fractional quantum Hall states.

机译:分母分数量子霍尔态的超低温研究。

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摘要

We have constructed a specialized experimental setup with integrated magnetic field independent thermometry, which has enabled us to cool the charge carriers in two dimensional electron gases down to 5 mK, and reliably measure the temperature. Using this setup, we have conducted studies of nu=5/2 fractional quantum Hall state(FQHS) in so far unexplored regions of the parameter space. Using a sample with a tunable density, we observe, for the first time, an evidence of a transition at nu=5/2 filling factor. This transition takes place at the lowest density at which nu=5/2 state had been measured to date, around 6x1010cm-2. Using a different set of samples, we also demonstrate a consistent way to account for the disorder contribution to the energy gap of nu=5/2 FQHS for several samples of vastly different densities. This lets us quantify, for the first time, the dependence of the experimentally measured intrinsic gap at nu=5/2 on Landau level mixing alone. Finally, we have conducted an ultra-low temperature study of the fractional quantum Hall states in the 1/3
机译:我们构建了具有集成磁场独立测温仪的专门实验装置,这使我们能够将二维电子气中的载流子冷却至5 mK,并可靠地测量温度。使用这种设置,我们对参数空间到目前为止尚未探索的区域中的nu = 5/2分数量子霍尔状态(FQHS)进行了研究。我们使用密度可调的样品,首次观察到在nu = 5/2填充因子处发生转变的证据。这种转变发生在迄今为止已测量到nu = 5/2状态的最低密度下,约为6x1010cm-2。使用一组不同的样本,我们还展示了一种一致的方法,可以解释几种密度大不相同的样本对nu = 5/2 FQHS能隙的无序贡献。这使我们首次量化了在nu = 5/2处实验测量的固有间隙对Landau能级混合的依赖性。最后,我们对1/3

著录项

  • 作者

    Samkharadze, Nodar.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Condensed matter physics.;Low temperature physics.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 103 p.
  • 总页数 103
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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