Nonlinear excitation kinetics of biased quantum wells. Coherent dynamical screening effect

Dmitry Turchinovich, Peter Uhd Jepsen

Research output: Contribution to journalJournal articleResearchpeer-review


In 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 of 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.
Original languageEnglish
JournalPhysica Status Solidi. C, Current topics in solid state physics
Issue number7
Pages (from-to)2494-2497
Publication statusPublished - 2006

Cite this