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arXiv 0909.1403cond-mat.mes-hall
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量子霍尔系统中扩散热电势的测量

Measurement of diffusion thermopower in the quantum Hall systems

K. Fujita, A. Endo, S. Katsumoto, Y. Iye

摘要:

本文采用电流加热技术,在0 $<B<$ ~ 3.4 T的磁场范围内,测量了低温($T$ =40 mK)下二维电子气的扩散热电势。为此目的设计了一种霍尔棒装置,其包含两个交叉的霍尔棒,一个用于测量,另一个用作加热器,并且配备有金属前门以控制待加热区域的电阻率。在低磁场区($B\leq$ 1 T),我们得到了横向热电势$S_{yx}$,它与用广义Mott公式计算的磁致伸缩系数$S_{yx}$定量一致.在量子霍尔区($B\geq$ 1 T),我们发现,$S_{yx}$信号出现时,只有测量和加热器面积都在电阻(量子间霍尔跃迁)区域。观察到异常的栅极电压依赖性高于$\sim$ 1.8 T,在测量区域中的自旋分裂变得明显。

英文摘要:

We have measured diffusion thermopower in a two-dimensional electron gas at low temperature ($T$=40 mK) in the field range 0 $<B<$ 3.4 T, by employing the current heating technique. A Hall bar device is designed for this purpose, which contains two crossing Hall bars, one for the measurement and the other used as a heater, and is equipped with a metallic front gate to control the resistivity of the areas to be heated. In the low magnetic field regime ($B\leq$ 1 T), we obtain the transverse thermopower $S_{yx}$ that quantitatively agrees with the $S_{yx}$ calculated from resistivities using the generalized Mott formula. In the quantum Hall regime ($B\geq$ 1T), we find that $S_{yx}$ signal appears only when both the measured and the heater area are in the resistive (inter-quantum Hall transition) region. Anomalous gate-voltage dependence is observed above $\sim$1.8 T, where spin-splitting in the measured area becomes apparent.

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