title: Two-pulse nondegenerate excitation of electron-hole wave packets in quantum wells: tunable terahertz emission.
abstract: It was shown recently that driving an optically excited quantum well with a terahertz (THz) frequency electric field can lead to higher-harmonic generation in the THz regime: the THz analog of the dynamic Franz-Keldysh effect. We propose a new double-pulse excitation method that not only increases the efficiency of the harmonic generation but is also able to control somewhat the dominant upshifted harmonic of the THz radiation by means of selective excitation of spatially chosen electron-hole relative motion wave packets.
authors: S
authors: S
authors: Hughes
authors: D S
authors: DS
authors: Citrin