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arXiv 1108.3243cond-mat.mes-hall
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量子霍尔体系中的双顶栅石墨烯晶体管

Dual top gated graphene transistor in the quantum Hall regime

Ajay K. Bhat, Vibhor Singh, Sunil Patil, Mandar M. Deshmukh

摘要:

我们研究了使用双顶栅几何结构的石墨烯场效应晶体管中的电荷密度和载流子类型的局部调制的效果。两个顶栅导致多个\emph{p-n}结的形成。在低温和磁场存在下的电子输运测量显示了不同的整数和分数量子化电导平台。我们解释这些结果的基础上的边缘通道的混合,并发现,不均匀性起着重要的作用,在定义这些高原,计量应用的\emph{p-n}结的关键问题的精确量化。

英文摘要:

We study the effect of local modulation of charge density and carrier type in graphene field effect transistors using a double top gate geometry. The two top gates lead to the formation of multiple \emph{p-n} junctions. Electron transport measurements at low temperature and in the presence of magnetic field show various integer and fractionally quantized conductance plateaus. We explain these results based on the mixing of the edge channels and find that inhomogeneity plays an important role in defining the exact quantization of these plateaus, an issue critical for the metrology applications of \emph{p-n} junctions.

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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