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arXiv 0908.0461cond-mat.mes-hall
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石墨烯量子-霍尔平台-平台跃迁的标度

Scaling of the quantum-Hall plateau-plateau transition in graphene

A. J. M. Giesbers, U. Zeitler, L. A. Ponomarenko, R. Yang, K. S. Novoselov, A. K. Geim, J. C. Maan

摘要:

石墨烯中的磁导率的温度依赖性表明,对于电子和空穴的N=1朗道能级,纵向电导率峰的宽度显示出遵循具有标度指数$κ= 0.37\pm0.05$的$Δν\propto T^κ$的幂律行为。类似地,量子霍尔平台跃迁的最大导数$(dσ_{xy}/dν)^{max}$标度为具有第一和第二电子和空穴朗道能级的标度指数$κ= 0.41\pm0.04$的$T^{-κ}$。这些结果证实了临界标度指数的普遍性。然而,在第零朗道能级,宽度和导数基本上是温度无关的,我们解释的温度无关的固有长度,掩盖了预期的普遍标度行为的第零朗道能级。

英文摘要:

The temperature dependence of the magneto-conductivity in graphene shows that the widths of the longitudinal conductivity peaks, for the N=1 Landau level of electrons and holes, display a power-law behavior following $Δν\propto T^κ$ with a scaling exponent $κ= 0.37\pm0.05$. Similarly the maximum derivative of the quantum Hall plateau transitions $(dσ_{xy}/dν)^{max}$ scales as $T^{-κ}$ with a scaling exponent $κ= 0.41\pm0.04$ for both the first and second electron and hole Landau level. These results confirm the universality of a critical scaling exponent. In the zeroth Landau level, however, the width and derivative are essentially temperature independent, which we explain by a temperature independent intrinsic length that obscures the expected universal scaling behavior of the zeroth Landau level.

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