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High-frequency conductivity experiments on the integer quantum Hall effect at the limits of universality

机译:普遍性极限下整数量子霍尔效应的高频电导实验

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The localization/delocalization transitions in the Landau levels (LL) related to the integer quantum Hall effect (QHE) are examined by studying the DC and high-frequency (35 GHz) conductivity sigma(xx) of a two-dimensional electron system (2DES) in AlGaAs/GaAs in the temperature range 0.3-4 K. Because of the observed asymmetric shape of sigma(xx)(B) between its QHE minima the peak widths are determined separately for the low and high magnetic held side. In the DC data the temperature dependence of the low-held width follows a power law with exponents close to those expected from scaling theory, the high-field width shows far higher exponents. In the high-frequency data only at the lowest temperatures (h(f) much greater than kT) the width becomes temperature independent according to the dynamical scaling theory. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 9]
机译:通过研究二维电子系统(2DES)的直流电和高频(35 GHz)电导率sigma(xx),研究了与整数量子霍尔效应(QHE)相关的Landau能级(LL)中的定位/离域转变。 )在0.3-4 K的温度范围内的AlGaAs / GaAs中。由于在QHE极小值之间观察到sigma(xx)(B)的不对称形状,因此分别确定了低和高磁保持面的峰宽。在DC数据中,低保持宽度的温度依赖性遵循幂定律,其指数接近于定标理论所期望的指数,高场宽度显示出高得多的指数。在高频数据中,只有在最低温度(h(f)远大于kT)时,宽度才根据动态缩放理论变得与温度无关。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:9]

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