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HIGH CUMULANTS OF CURRENT FLUCTUATIONS OUT OF EQUILIBRIUM

机译:大量的电流波动达到平衡

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We consider high order current cumulants in disordered systems out of equilibrium. They are interesting and reveal information which is not easily exposed by the traditional shot noise. Despite the fact that the dynamics of the electrons is classical, the standard kinetic theory of fluctuations needs to be modified to account for those cumulants. We perform a quantum-mechanical calculation using the Keldysh technique and analyze its relation to the quasi classical Boltzmann-Langevin scheme. We also consider the effect of inelastic scattering. Strong electron-phonon scattering renders the current fluctuations Gaussian, completely suppressing the n > 2 cumulants. Under strong electron-electron scattering the current fluctuations remain non-Gaussian.
机译:我们认为无序系统中的高阶电流累积量不平衡。它们很有趣,并揭示了传统散粒噪声不易暴露的信息。尽管电子的动力学是经典的事实,但仍需要修改标准的涨落动力学理论以解决这些累积量。我们使用Keldysh技术执行量子力学计算,并分析其与准经典Boltzmann-Langevin方案的关系。我们还考虑了非弹性散射的影响。强的电子声子散射使电流波动呈高斯分布,从而完全抑制了n> 2的累积量。在强电子-电子散射下,电流波动保持为非高斯分布。

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