纳米器件电流噪声的散射理论统一模型研究

A unified scattering theory model for current noise in nanoscale devices

传统散射理论在研究器件噪声特性时,并没有考虑非相干输运和库仑作用对散粒噪声的抑制,而在实际纳米器件中这两种效应不可忽略.本文基于散射区等效接触端模型推导了考虑上述两种效应的电流噪声散射理论统一模型,该模型适用于从相干输运到非相干输运的整个输运区,并同时考虑了泡利不相容原理和库仑作用对散粒噪声的抑制.本文也提出了一种基于统一模型的电流噪声数值模拟方法,该方法所得散射区特性与散射区等效接触端模型特性一致.

In the study of the noise characteristics of devices by traditional scattering theory,the incoherent transport and the effect of Coulomb interaction on shot noise are not taken into account, which may not be ignored in real nanoscale devices. Based on the equivalent contact model of the scattering region, we derive a unified scattering theory model for current noise, including the effects mentioned above. Our model covers the whole range of transport regime from coherent transport to incoherent transport. Our model also includes the effects of Pauli exclusion and Coulomb interaction on shot noise. Then, a numerical simulation approach is presented for our model. The approach coincides with the equivalent contact model in the property of the scattering region.