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External-field-induced electric dipole moment of biexcitons in a semiconductor

Elektrisches Dipolmoment von Biexzitonen induziert durch ein externes Feld


Physical Review. B 52 (1995), Nr.24, S.R16993-R16996
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Fraunhofer IAF ()
aluminium compounds; biexcitons; binding energy; electro-optical effects; gallium arsenide; III-V semiconductors; multiwave mixing; quantum wells; time resolved measurement; zeitaufgelöste elektrische 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 vibronic 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 this experiment, an ultrafast nonresonant excitation mechanism of biexcitons is inferred.