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Direct measurement of the spatial displacement of bloch-oscillating electrons in semiconductor superlattices

Direkte Messung der räumlichen Verschiebung von blochoszillierenden Elektronen in Halbleiter-Übergittern


Physical review letters 79 (1997), Nr.2, S.301-304
ISSN: 0031-9007
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductors; quantum wells; time resolved photoluminescence; zeitaufgelöste Photolumineszenz

The absolute spatial displacement of Bloch-oscillating electrons in semiconductor superlattices is measured as a function of time with a few angstrom resolution using a novel experimental technique: The oscillating Bloch wave packet creates a small dipole field which can be determined using the field shift of the Wannier-Stark ladder transitions as a sensitive detector. The total amplitudes and their dependence on the static electric field are in good agreement with a theory including excitonic effects.