23 April 1998 Dynamics of Bloch oscillations in semiconductor superlattices: direct determination of displacement
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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.
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Markas Sudzius, Markas Sudzius, Vadim G. Lyssenko, Vadim G. Lyssenko, Falk Loeser, Falk Loeser, Gintaras Valusis, Gintaras Valusis, Tom Hasche, Tom Hasche, Karl Leo, Karl Leo, Marc M. Dignam, Marc M. Dignam, Klaus Koehler, Klaus Koehler, "Dynamics of Bloch oscillations in semiconductor superlattices: direct determination of displacement", Proc. SPIE 3277, Ultrafast Phenomena in Semiconductors II, (23 April 1998); doi: 10.1117/12.306142; https://doi.org/10.1117/12.306142

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