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Proceedings Paper

Dynamics of Bloch oscillations in semiconductor superlattices: direct determination of displacement
Author(s): Markas Sudzius; Vadim G. Lyssenko; Falk Loeser; Gintaras Valusis; Tom Hasche; Karl Leo; Marc M. Dignam; Klaus Koehler
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Paper Abstract

We investigate the spatial displacement dynamics of optically excited wave packets in semiconductor superlattices. A short laser pulse exciting semiconductor superlattice induces quantum beats between different excitonic states that in turn leads to formation of a time-varying coherent wave packet. The real space oscillation of the excited wave packet identifies these quantum beats of the Wannier-Stark states as Bloch oscillations: We present an experimental technique which measures directly the displacement of the wave packet center- of-mass. The oscillating Bloch wave packets create a microscopic dipole moment which can be detected using the shift of the Wannier-Stark ladder transition energy as a sensitive field detector. We show that the Bloch wave packet undergoes harmonic spatial motion, proving for the first time the predictions of Bloch and Zener. The influence of an experimental conditions on displacement of the Bloch wave packet is discussed.

Paper Details

Date Published: 23 April 1998
PDF: 8 pages
Proc. SPIE 3277, Ultrafast Phenomena in Semiconductors II, (23 April 1998); doi: 10.1117/12.306142
Show Author Affiliations
Markas Sudzius, Technische Univ. Dresden (Germany)
Vadim G. Lyssenko, Technische Univ. Dresden (Germany)
Falk Loeser, Technische Univ. Dresden (Germany)
Gintaras Valusis, Technische Univ. Dresden (Lithuania)
Tom Hasche, Technische Univ. Dresden (Germany)
Karl Leo, Technisce Univ. Dresden (Germany)
Marc M. Dignam, Lakehead Univ. (Canada)
Klaus Koehler, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)


Published in SPIE Proceedings Vol. 3277:
Ultrafast Phenomena in Semiconductors II
Kong-Thon F. Tsen; Harold R. Fetterman, Editor(s)

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