Dekorsy, T.T.DekorsyLeisching, P.P.LeischingWaschke, C.C.WaschkeKöhler, KlausKlausKöhlerLeo, K.K.LeoRoskos, H.G.H.G.RoskosKurz, H.H.Kurz2022-03-032022-03-031994https://publica.fraunhofer.de/handle/publica/18533410.1088/0268-1242/9/11S/017The coherent excitation of excitonic wavepackets in AlGaAs/GaAs superlattices is investigated in a comparative study employing three different timeresolved optical techniques. The experimental results obtained in time-resolved four-wave mixing (FWM), THz emission spectroscopy and transmissive electro-optic sampling (TEOS) provide the final proof of the existence of Bloch oscillations in the THz range. Each of these measurements provides complementary information on these oscillations. As a result, Bloch oscillations appear as a special case of quantum interference involving the coherent superposition of Wannier-Stark states.enIII-V HalbleiterIII-V semiconductorstime resolved electrical measurementtime resolved optical measurementzeitaufgelöste elektrische Messungzeitaufgelöste optische Messung621667530journal article