基于自洽输运理论的介观体系动态电导的研究  

Investigation on the dynamic conductance of mesoscopic system based on the self-consistent transport theory

作　　者：全军[1,2] T. C. Au Yeung 邵乐喜[1] 

机构地区：[1]湛江师范学院物理科学与技术学院,湛江524048 [2]南洋理工大学电子电气工程学院,新加坡639798

出　　处：《物理学报》2011年第8期589-594,共6页Acta Physica Sinica

基　　金：广东省高等学校优秀青年创新人才培养计划(批准号:LYM10098);湛江师范学院博士科研基金(批准号:ZL1004)资助的课题~~

摘　　要：基于介观体系电子动态输运的自洽理论,讨论了介观结构的动态电导.作为该理论的应用,采用一介观相干平行板电容器模型来进行研究.结果表明:体系的动态电导与外场频率和体系费米能有关,为一复数且有有限虚部.当外场频率较小时,动态电导随费米能的变化所呈现的特性和直流情形非常相似,但是随着外场频率的增加,两者差异就变得非常明显,体系动态电导随外场频率的变化呈现一些峰值结构.在给定体系费米能时,动态电导随着外场频率的变化而产生振荡,并且出现了负的电导虚部,电导虚部的正负表明了体系的电容特性和电感特性.According to the self-consistent electronic dynamic transport theory of mesoscopic system,we present the dynamic conductance of mesoscopic structure.As an application of this theory,we employ a coherent mesoscopic parallel-plate capacitor model in the present study.The results show that the dynamic conductance of system depends on the frequency of external field and Fermi energy of system,and is a complex with a finite imaginary part.For a smaller frequency,the conductance shows a similar feature to dc case,but with the increase of the frequency of external fields,substantial deviations between dc case and ac case are observed,the dynamic conductance of system presents a peak structure with Fermi energy varying.For a given Fermi energy,the dynamic conductance is oscillatory with frequency varying,moreover some negative imaginary parts of conductance are observed.The negative imaginary part implies the capacitive behavior,and positive imaginary part refers to the inductive behavior.

关 键 词：自洽输运理论 相干平行板电容器 电导 介观体系 

分 类 号：O488[理学—固体物理]