Far-infrared optical transitions in a corrugated interface under normally applied electric fields

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We calculate the subband structures and inter-subband transitions in a corrugated GaAs-AlAs interface under normally applied electric fields. It is found that the first energy minigap of the system can be tuned linearly using the normally applied electric fields, and an anisotropy in the inter-subband optical absorptions exists for a linearly polarized incident light wave. The dependence of the inter-subband transition spectra on the interface structures and external electric fields is discussed.