Local density of states of dc-biased superlattices with time-dependent imperfection  

作　　者：阎维贤 李向荣 

机构地区：[1]Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China

出　　处：《Chinese Physics B》2006年第4期822-827,共6页中国物理B（英文版）

基　　金：Project supported by the Natural Science Foundation of Shanxi Province （Grant No 20031006）.

摘　　要：The single-particle Green＇s function for a dc-biased superlattices with single impurity potential varying harmonically with time has been obtained in the framework of U（t,t＇） method and Floquet-Green＇s function. The calculation of the local density of states shows that new states will emerge between the resonant Wannier-Stark states as a result of the intervention of time-dependent impurity potential, and the increase in electric field strength of impurity will result in the growing of the number of new states between the gaps of neighbouring Stark ladders.The single-particle Green＇s function for a dc-biased superlattices with single impurity potential varying harmonically with time has been obtained in the framework of U（t,t＇） method and Floquet-Green＇s function. The calculation of the local density of states shows that new states will emerge between the resonant Wannier-Stark states as a result of the intervention of time-dependent impurity potential, and the increase in electric field strength of impurity will result in the growing of the number of new states between the gaps of neighbouring Stark ladders.

关 键 词：local density of states  Floquet-Green＇s function defects and impurity 

分 类 号：O7[理学—晶体学]