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Coherent Dynamics of Excitons and Biexcitons: Polarization and Intensity Dependence
Author(s) -
Haase B.,
Neukirch U.,
Gutowski J.,
Bartels G.,
Stahl A.,
Nürnberger J.,
Faschinger W.
Publication year - 1998
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/(sici)1521-3951(199803)206:1<363::aid-pssb363>3.0.co;2-t
Subject(s) - biexciton , polarization (electrochemistry) , exciton , physics , density matrix , angular momentum , condensed matter physics , atomic physics , quantum mechanics , quantum , chemistry
A systematic analysis of excitonic and biexcitonic contributions to four‐wave mixing in dependence on the polarization state and on the intensity of the exciting beams is presented for ZnSe/Zn 1— x Mg x S y Se 1—iiy quantum wells. The relative signals of excitons and biexcitons for different polarization configurations are discussed in terms of a microscopic density matrix model revealing excellent correspondence to the complex experimental data. In configurations which do not allow for a third‐order contribution of the biexciton of zero angular momentum higher‐order correlations are shown to become important already at densities as low as 10 10 excitons cm —2 /pulse.