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We have investigated hydrated model membranes, formed by stacked bilayers of unsaturated lipids, by means of terahertz time-domain and infrared spectroscopy. Terahertz spectroscopy enables the investigation of water dynamics, owing to its sensitivity to dielectric relaxation processes associated with water reorientation. By controlling the number of water molecules per lipid molecule in the system,...
We present a complementary study of the interband and intraband dynamics of optically excited Bloch oscillations in GaAs/Al x Ga 1-x As superlattices. Distinct differences in the frequency and dephasing of the oscillations give evidence for Bloch oscillations performed by electrons in continuum states and by excitonic wavepackets. The dephasing time of the electronic...
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