Local density of states of dc-biased superlattices with time-dependent imperfection |
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Authors: | Yan Wei-Xian and Li Xiang-Rong |
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Affiliation: | Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China |
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Abstract: | The single-particle Green's function for a dc-biased superlattices with single impurity potential varying harmonically with time hasbeen obtained in the framework of U(t,t') method andFloquet--Green's function. The calculation of the local density ofstates shows that new states will emerge between the resonantWannier--Stark states as a result of the intervention of time-dependent impurity potential, and the increase in electric fieldstrength of impurity will result in the growing of the number ofnew states between the gaps of neighbouring Stark ladders. |
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Keywords: | local density of states Floquet-Green's function defects and impurity |
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