%0 Journal Article
%T Local density of states of dc-biased superlattices with time-dependent imperfection
%A Yan Wei-Xian
%A Li Xiang-Rong
%A <br>阎维贤
%A 李向荣
%J 中国物理 B
%D 2006
%I 
%X 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.
%K local density of states
%K Floquet-Green's function
%K defects and impurity<br>局部态密度
%K Floquet-Green函数
%K 缺陷
%K 杂质
%K 超晶格
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=8DDB48E359AD96F06586F9F1F5309045&yid=37904DC365DD7266&vid=23CCDDCD68FFCC2F&iid=E158A972A605785F&sid=F7C11D7E3E8C5D3F&eid=AC3946AB81989513&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=20