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Terahertz Bloch oscillations in semiconductor superlattices

Terahertz Blochoszillationen in Halbleiter-Übergittern

: Dekorsy, T.; Leisching, P.; Waschke, C.; Köhler, K.; Leo, K.; Roskos, H.G.; Kurz, H.

	Semiconductor Science and Technology 9 (1994), pp.1959-1964 : Abb.,Lit. ISSN: 0268-1242 ISSN: 1361-6641

	English
	Journal Article
	Fraunhofer IAF ()
	III-V Halbleiter; III-V semiconductors; time resolved electrical measurement; time resolved optical measurement; zeitaufgelöste elektrische Messung; zeitaufgelöste optische Messung

Abstract
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.

: http://publica.fraunhofer.de/documents/PX-36195.html