Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 35: HL Poster II
HL 35.54: Poster
Wednesday, April 3, 2019, 17:30–20:00, Poster E
Spatiotemporal Dynamics of correlated Carrier Wave Packets in Semiconductors — •Frank Lengers1, Roberto Rosati2, Tilmann Kuhn1, and Doris E. Reiter1 — 1Westfälische Wilhelms-Universität Münster, Germany — 2Chalmers University of Technology, Sweden
Highly focused optical excitation of semiconductors in real space results in strongly localized carrier distributions in the material. Subsequent transport of the excited carrier wave packets occurs on nanometer and picosecond scales and is influenced by the Coulomb interaction. Since the Coulomb interaction in heterostructures of low dimensionality is enhanced with respect to the bulk, we here study a one-dimensional quantum wire as an example system where strongly interacting electrons and holes can be excited. We treat a system of up to two photoexcited electron-hole pairs within a wave function approach and are thereby able to treat the carrier correlations exactly. The wave packet dynamics is analyzed as function of the excited density and excitation energy. We show that high densities can lead to travelling electron-hole wave packets or to enhanced wave packet broadening depending on the excitation conditions.