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arXiv 1105.4055cond-mat.mes-hall
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石墨烯、量子霍尔效应的普遍性和SI系统的重新定义

Graphene, universality of the quantum Hall effect and redefinition of the SI system

T. J. B. M. Janssen, N. E. Fletcher, R. Goebel, J. M. Williams, A. Tzalenchuk, R. Yakimova, S. Kubatkin, S. Lara-Avila, V. I. Falko

摘要:

国际单位制(SI系统)即将经历半个世纪以来最大的变化,分别根据基本常数h和e重新定义质量和电流的单位。这种变化主要依赖于将这些常数与可测量量联系起来的关系的精确性。在这里,我们直接比较的整数量子霍尔效应在外延石墨烯和GaAs/AlGaAs异质结构。我们发现,在8.6 \times 10-11测量的相对标准不确定度内,量子化电阻值没有差异,这是对量子霍尔效应在材料独立性方面的普遍性的最严格测试。

英文摘要:

The Système Internationale d'unités (SI system) is about to undergo its biggest change in half a century by redefining the units for mass and current in terms of the fundamental constants h and e, respectively. This change crucially relies on the exactness of the relationships which link these constants to measurable quantities. Here we directly compare the integer quantum Hall effect in epitaxial graphene with that in GaAs/AlGaAs heterostructures. We find no difference of the quantized resistance value within the relative standard uncertainty of our measurement of 8.6\times10-11, being the most stringent test of the universality of the quantum Hall effect in terms of material independence.

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