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Within the one-dimensional tight-binding minibands and on-site  Coloumbic interaction approximation, the absorption spectrum and coherentwavepacket time evolution in an optically excited semiconductor superlatticedriven by dc-ac electric fields are investigated using the semiconductor Blochequations.  The dominating roles of the ratios of dc-Stark to external ac frequency, aswell as ac-Stark to external ac frequency, is emphasized. If the former is aninteger ${\cal N}$, then also ${\cal N}$ harmonics are present within one Starkfrequency, while the fractional case leads to the formation of excitonicfractional ladders. The later ratio determines the size and profile of thewavepacket. In the absence of excitonic interaction it controls the maximumsize wavepackets reach within one cycle, while the interaction produces astrong anisotropy and tends to palliate the dynamic wavepacket localization.Comment: 14 pages, 7 postscript figure

Absorption and wave packets in optically excited semiconductor superlattices driven by direct-current-alternating-current (dc-ac) fields