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Coherent dynamics of excitonic and biexcitonic wave packets in semiconductor superlattices

Kohärente Dynamik von exzitonischen und biexzitonischen Wellenpaketen in Halbleiterübergittern
 

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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
English
Journal Article
Fraunhofer IAF ()
heterostructure; Heterostruktur; III-V Halbleiter; III-V semiconductors; quantum wells; time resolved measurement; zeitaufgelöste Messung

Abstract
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.

: http://publica.fraunhofer.de/documents/PX-8031.html