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Evaluation of the Hartree‐Fock Theory of the Excitonic Optical Stark Effect
Author(s) -
Ell C.,
Müller J. F.,
Sayed K. El,
Banyai L.,
Haug H.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221500207
Subject(s) - stark effect , exciton , coulomb , atomic physics , polarization (electrochemistry) , relaxation (psychology) , spectral line , chemistry , hartree , oscillator strength , physics , condensed matter physics , quantum mechanics , psychology , social psychology , electron
Semiconductor band‐edge absorption spectra of a probe beam under the action of a nonresonant pump beam are evaluated and analyzed, both for two and three dimensional systems. Many‐body effects such as phase space filling and carrier–carrier Coulomb interactions are included within the Hartree‐Fock approximation. In contrast to the atomic optical Stark effect one obtains an exciton blue shift with a nearly constant (2d) or sligthly increasing (3d) exciton oscillator strength. In addition, effects due to the time dependence of the fields are studied, taking pump pulse width, polarization relaxation time and the time delay between pump‐ and probe pulse into account. Deviations from the time independent Hartree‐Fock calculations occur both, with respect to the shift itself and with respect to the shape of the outcoming signal. The results do not reflect all features of earlier experiments, but they are in agreement with recent experimental observations.