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Coherent dynamics of excitonic and biexcitonic wave packets in semiconductor superlattices

Kohärente Dynamik von exzitonischen und biexzitonischen Wellenpaketen in Halbleiterübergittern


Il Nuovo Cimento della societa Italiana di Fisica. D, Condensed matter, atomic, molekular and chemical physics, fluids, plasmas, biophysics 17D (1995), No.11/12, pp.1573-1578
ISSN: 0392-6737
Journal Article
Fraunhofer IAF ()
heterostructure; Heterostruktur; III-V Halbleiter; III-V semiconductors; quantum wells; time resolved measurement; zeitaufgelöste Messung

We report on the observation of an electric-field-induced electric-dipole moment of biexcitonic molecules in a GaAs/Al0.3Ga0.7As superlattice. The macroscopic oscillating electric field, associated with the microscopic wave packet dipole moments, is monitored by time-resolved transmittive electro-optic sampling. The field dependence of the biexcitonic binding energy is detected by transient four-wave mixing. From these experiments, an ultrafast non-resonant excitation mechanism of biexcitons is inferred.