量子相干性对耦合双量子点全计数统计的影响  

Effect of Uantum Coherence on Coupled-double Quantum Dots' Full Counting Statistics

作　　者：郭小芳[1] 

机构地区：[1]山西大学理论物理研究所

出　　处：《山西大同大学学报（自然科学版）》2014年第2期30-32,38,共4页Journal of Shanxi Datong University(Natural Science Edition)

摘　　要：根据有效粒子数分辨的量子主方程的方法,研究了并联耦合双量子点系统电子的全计数统计。当量子点间的隧穿耦合强度与量子点电极的耦合强度的数值接近时,量子相干性,即系统约化密度矩阵的非对角元开始对系统的电子全计数统计特性起作用。特别是,量子点之间的隧穿耦合强度相对越弱,系统约化密度矩阵的非对角元对系统的电子全计数统计影响就越加明显;同时,量子点之间的隧穿耦合强度小到一定程度时,系统约化密度矩阵的非对角元对系统的电子全计数统计影响将会趋于稳定。We study the full counting statistics of electron transport through coupled-double quantum dots based on an efficient particle-number-resolved master equation. When the value of inter-dot hopping coupling and the strength between the dot and electrode is the same order magnitude, the quantum coherence（off-diagonal element） has an influence on the coupled-double quantum dots＇ full counting statistics. The weaker of the inter-dot hopping coupling, the more obvious of the influence, moreover, When the value of inter-dot hopping coupling tend to be extent weaker, quantum coherence on the influence of full counting statistics of dots tend to be more stable.

关 键 词：全计数统计 非对角元 量子相干 

分 类 号：O413[理学—理论物理]