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arXiv 1402.2989cond-mat.mes-hallcond-mat.str-el
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合金无序下的$ν=5/2$分数量子霍尔态

The $ν=5/2$ Fractional Quantum Hall State in the Presence of Alloy Disorder

Nianpei Deng, G. C. Gardner, S. Mondal, E. Kleinbaum, M. J. Manfra, G. A. Csáthy

摘要:

我们报告的影响合金无序的$ν=5/2$分数量子霍尔态的定量测量。合金无序由量子阱的Al $_x$ Ga $_{1-x}$ As沟道中的铝含量$x$控制。我们发现合金散射抑制了$ν=5/2$态。令我们惊讶的是,在具有合金无序的样品中,当与其中合金无序不是主要散射机制的样品相比时,$ν=5/2$状态出现在显著降低的迁移率。我们的研究结果突出了不同类型的障碍存在于这些样品中,如短程合金和长程库仑无序的不同作用。

英文摘要:

We report quantitative measurements of the impact of alloy disorder on the $ν=5/2$ fractional quantum Hall state. Alloy disorder is controlled by the aluminum content $x$ in the Al$_x$Ga$_{1-x}$As channel of a quantum well. We find that the $ν=5/2$ state is suppressed with alloy scattering. To our surprise, in samples with alloy disorder the $ν=5/2$ state appears at significantly reduced mobilities when compared to samples in which alloy disorder is not the dominant scattering mechanism. Our results highlight the distinct roles of the different types of disorder present in these samples, such as the short-range alloy and the long-range Coulomb disorder.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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