Abstract
AbstractIn this paper we describe a strongly nonlinear process of ultrafast photoexcitation of a biased quantum well. This process is governed by coherent dynamical screening, where the instantaneously polarized photoexcited carriers screen initial bias field. This results in a dynamic modification of the bandstructure of the quantum well, which is totally coherent with the temporal intensity distribution in the excitation laser pulse. We developed a time‐resolved theoretical model of coherent dynamical screening, which predicts interesting fundamental consequences, such as nonlinear absorption and ultra‐broadband THz emission. The results of our THz and optical experiments are in good agreement with the theoretical model. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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