介观二能级体系的量子输运特性研究  

Quantum transport characteristics in mesoscopic two-level system

作　　者：胡兢[1] 骆钧炎[1] 

机构地区：[1]浙江科技学院理学院,杭州310023

出　　处：《浙江科技学院学报》2016年第1期24-31,共8页Journal of Zhejiang University of Science and Technology

基　　金：国家自然科学基金项目(11204272);浙江省自然科学基金项目(LY15A040007)

摘　　要：利用电子数分辨的量子主方程,推导了介观输运体系中的电流和散粒噪声计算方法,研究了二能级体系的量子输运特性。在非对称隧穿耦合强度下,电流输运出现了快慢通道的输运机制,导致了动态库伦阻塞,以及新颖的负微分电导现象和超泊松散粒噪声。这些研究结果对量子器件的实现、优化和控制具有一定的实际意义。Based on the electron-number-resolved quantum master equation,an approach to the calculation of current and shot noise in mesoscopic system is derived,which allows us to study transport properties in a quantum two-level system.Under the condition of asymmetric tunnelcouplings,a fast-to-slow mechanism is developed in electron transport,which leads to a dynamic Coulomb blockade,negative differential conductance,as well as super-Poisonian shot noise.It may be of great significance in the realization,optimization and control of quantum devices.

关 键 词：量子点 介观体系 散粒噪声 输运特性 

分 类 号：O469[理学—凝聚态物理]