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arXiv 0707.4582cond-mat.mes-hallcond-mat.str-el
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颗粒金属中的霍尔效应:弱局域化修正

Hall Effect in Granular Metals: Weak Localization Corrections

Maxim Yu. Kharitonov, Konstantin B. Efetov

摘要:

我们研究了在大隧穿电导$g_{T}\gg 1$对应于金属制度的颗粒系统中局域化对霍尔输运的影响。我们证明了二维或三维颗粒阵列的霍尔电阻率的1/g_T弱局域化修正的一阶为零,即$\de ρ_{xy}^{WL}=0$。这一结果与普通无序金属的结果一致。由于精确的抵消,我们的结果适用于任意相关的温度T和磁场H值,既适用于对应于普通无序金属的非常低的T和H的“无序”区域,也适用于T或H值较高的“结构相关”区域。

英文摘要:

We study the effects of localization on the Hall transport in a granular system at large tunneling conductance $g_{T}\gg 1$ corresponding to the metallic regime. We show that the first-order in 1/g_T weak localization correction to Hall resistivity of a two- or three-dimensional granular array vanishes identically, $\de ρ_{xy}^{WL}=0$. This result is in agreement with the one for ordinary disordered metals. Being due to an exact cancellation, our result holds for arbitrary relevant values of temperature T and magnetic field H, both in the ``homogeneous'' regime of very low T and H corresponding to ordinary disordered metals and in the ``structure-dependent'' regime of higher values of T or H.

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