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arXiv 0903.4806cond-mat.str-elcond-mat.dis-nn
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二维In-$_{x}$-Ga $_{1-x}$-As电子系统中相互作用对电导率贡献的无序和温度重整化

Disorder and temperature renormalization of interaction contribution to the conductivity in two-dimensional In$_{x}$Ga$_{1-x}$As electron systems

G. M. Minkov, A. V. Germanenko, O. E. Rut, A. A. Sherstobitov

摘要:

本文研究了二维In $_{0.2}$ Ga $_{0.8}$ As电子系统在宽电导率范围$σ\simeq(1-150) G_0$(其中$G_0=e^2/(2π^2\hbar)$ .我们表明,数据很好地描述的重整化群(RG)理论的单圈近似的框架内,当电导率相对较高,$σ\gtrsim 15 G_0$。在较低的电导率,实验结果被发现是在这个理论的预测与激烈的分歧。该理论预测的朗道费米液体振幅,控制在三重态通道的相互作用,比实验观察到的更强的重整化。另一个矛盾是,相互作用贡献的实验值实际上并不依赖于磁场,而RG理论预测其强烈的下降,由于在不断增长的磁场的电导率张量的对角分量减少。

英文摘要:

We study the electron-electron interaction contribution to the conductivity of two-dimensional In$_{0.2}$Ga$_{0.8}$As electron systems in the diffusion regime over the wide conductivity range, $σ\simeq(1-150) G_0$, where $G_0=e^2/(2π^2\hbar)$. We show that the data are well described within the framework of the one-loop approximation of the renormalization group (RG) theory when the conductivity is relatively high, $σ\gtrsim 15 G_0$. At lower conductivity, the experimental results are found to be in drastic disagreement with the predictions of this theory. The theory predicts much stronger renormalization of the Landau's Fermi liquid amplitude, which controls the interaction in the triplet channel, than that observed experimentally. A further contradiction is that the experimental value of the interaction contribution does not practically depend on the magnetic field, whereas the RG theory forecasts its strong decrease due to decreasing diagonal component of the conductivity tensor in the growing magnetic field.

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