Abstract
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.
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