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Author: Kuehn, W. × Type: Text ×

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    Ultrafast two-dimensional terahertz spectroscopy of elementary excitations in solids
    (Bristol : IOP, 2013) Woerner, M.; Kuehn, W.; Bowlan, P.; Reimann, K.; Elsaesser, T.
    Recent experimental progress has allowed for the implementation of nonlinear two-dimensional (2D) terahertz (THz) spectroscopy in the ultrafast time domain. We discuss the principles of this technique based on multiple phase-locked electric field transients interacting in a collinear geometry with a solid and the phase-resolved detection of the THz fields after interaction with the sample. To illustrate the potential of this new method, 2D correlation spectra of coupled intersubband-longitudinal optical phonon excitations in a double quantum well system and a study of ultrafast carrier dynamics in graphene are presented.
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    Transition from ballistic to drift motion in high-field transport in GaAs
    (Les Ulis : EDP Sciences, 2013) Bowlan, P.; Kuehn, W.; Reimann, K.; Woerner, M.; Elsaesser, T.; Hey, R.; Flytzanis, C.
    With strong THz pulses, we measure ultrafast transport of electrons, holes, and an electron-hole plasma in GaAs. The transition from ballistic to drift-like transport is strongly influenced by electron-hole scattering.