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Terahertz Bloch oscillations in semiconductor superlattices

Terahertz Blochoszillationen in Halbleiter-Übergittern


Semiconductor Science and Technology 9 (1994), pp.1959-1964 : Abb.,Lit.
ISSN: 0268-1242
ISSN: 1361-6641
Journal Article
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductors; time resolved electrical measurement; time resolved optical measurement; zeitaufgelöste elektrische Messung; zeitaufgelöste optische Messung

The 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.