相干介观系统中散粒噪声的Monte Carlo模拟方法研究  

Monte Carlo simulation of shot noise in the coherent and mesoscopic system

作　　者：陈华[1] 杜磊[1] 庄奕琪[2] 

机构地区：[1]西安电子科技大学技术物理学院,西安710071 [2]西安电子科技大学微电子学院,西安710071

出　　处：《物理学报》2008年第4期2438-2444,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60676053)资助的课题~~

摘　　要：根据电荷通过低温量子导体时具有的二项分布导致散粒噪声这一结论,结合Landauer电流公式的物理内涵建立了相干介观系统中的散粒噪声模型,并通过Monte Carlo模拟方法产生了散粒噪声时间序列.介观系统中散粒噪声的抑制来源于电子输运时的相关性,传输本征值双峰分布导致量子混沌腔和无序金属中的散粒噪声抑制.根据这两个结论,通过Monte Carlo模拟定性地分析了传输本征值分布与电子输运相关性之间的关系.According to the conclusion that the charge which passes through a low-temperature quantum conductor over fixed time has a binomial distribution, a shot noise model based on the physical implication of Landauer formula in the coherent and mesoscopic system is built, and time sequences of shot noise are produced by the Monte Carlo methods. It is well known that shot noise suppression in mesoscopic systems originates from the correlation in electron transport, and the bimodal probability distribution of the transmission eigenvalues in quantum chaos cavity and disordered metal leads to shot noise suppression, from which it is possible to correlate the distribution of the transmission eigenvalues and the correlation in electron transport.

关 键 词：散粒噪声 Landauer公式 介观系统 

分 类 号：O413.2[理学—理论物理]