Thomas-Fermi近似下一维量子线体系对外场的动态响应  

Dynamic Response to the External Fields for One-dimensional Quantum Wire Structure under the Thomas-Fermi Approximation

作　　者：全军[1] 田英[2] 

机构地区：[1]湛江师范学院物理科学与技术学院,广东湛江524048 [2]湛江师范学院博雅教育中心,广东湛江524048

出　　处：《湛江师范学院学报》2010年第6期59-63,共5页Journal of Zhanjiang Normal College

摘　　要：基于Thomas-Fermi近似,我们研究了一带宽电子库的一维量子线结构内部势函数和电荷密度的分布.数值结果表明电势和电子主要分布在电子库和量子线之间的传输区域.打开或增加一个量子通道或模式,电荷密度在传输区域出现尖锐的峰.在电子库中,特征势函数趋向于一或者零.We present an investigation of the dynamical response for a quantum wire structure with reservoirs basing on Thomas-Fermi approximation.The distribution of internal potential and charge density are calculated.Our numerical calculation for internal potential and charge density shows that the induced charge density is mainly distributed in transition regions between the reservoirs and the wire,and that once any quantum channel opens,the change density is very sharp and occurs in the transition regions.We show in our model that in the reservoirs the characteristic potentials tend to unity or zero.

关 键 词：介观体系 动态响应 纳米体系 托马斯—费米近似 一维量子线 动态输运 

分 类 号：O572.2[理学—粒子物理与原子核物理]