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首页> 外文会议>NATO Advanced Study Institute on Theory of Quantum Transport in Metallic and Hybrid Nanostructures; 20030825-29; St.Petersburg(RU) >Electron Transport in Granular Metals
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Electron Transport in Granular Metals

机译：粒状金属中的电子传输

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摘要

We investigate transport in a granular metallic system at large tunneling conductance between the grains, g_T 》 1. We show that at low temperatures, T ≤ g_Tδ, where δ is the single mean energy level spacing in a grain, the coherent electron motion at large distances dominates the physics, contrary to the high temperature (T > g_Tδ) behavior where conductivity is controlled by the scales of the order of the grain size. The conductivity of one and two dimensional granular metals, in the low temperature regime, decays with decreasing temperature in the same manner as that in homogeneously disordered metals, indicating thus an insulating behavior. However, even in this temperature regime the granular structure remains important and there is an additional contribution to conductivity coming from short distances. Due to this contribution the metal-insulator transition in three dimensions occurs at the value of tunnel conductance g_T~C = (1/6π) ln(Ec/δ), where E_C is the charging energy of an isolated grain, and not at the generally expected g_T~C ∝ 1. Corrections to the density of states of granular metals due to the electron-electron interaction are calculated.
机译：我们研究了在颗粒之间具有大隧穿电导的粒状金属系统中的传输g_T》1。我们表明，在低温下，T≤g_Tδ，其中δ是晶粒中的单个平均能级间距，在大的情况下相干电子运动距离支配着物理性质，这与高温（T>g_Tδ）行为相反，在高温行为中，电导率由晶粒度的数量级控制。一维和二维粒状金属的电导率在低温状态下以与均质无序金属相同的方式随温度降低而衰减，因此表明了绝缘行为。然而，即使在此温度范围内，颗粒结构仍然很重要，并且短距离对电导率还有其他贡献。由于这种贡献，在通道电导g_T〜C =（1 /6π）ln（Ec /δ）的值处发生了三维方向的金属-绝缘体转变，其中E_C是孤立晶粒的充电能，而不是通常期望的g_T〜C ∝ 1.计算由于电子-电子相互作用而引起的粒状金属态密度的校正。

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