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Neutral and Charged Exciton Photoluminescence in a Magnetic Field Studied for Different Electron Concentrations and g‐Factors
Author(s) -
Kutrowski M.,
Wojtowicz T.,
Kossacki P.,
Ciulin V.,
Kossut J.
Publication year - 2002
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 - 10.1002/1521-3951(200201)229:2<791::aid-pssb791>3.0.co;2-3
Subject(s) - exciton , photoluminescence , electron , magnetic field , polarization (electrochemistry) , condensed matter physics , circular polarization , atomic physics , physics , chemistry , optics , quantum mechanics
We report on the measurements of charged (X — ) and neutral (X) exciton cw photoluminescence (PL) in a magnetic field as a function of the electron concentration and carrier g ‐factors. We observe a strong influence of both of these parameters on the circular polarization degree of PL in remotely doped Cd 1— x Mn x Te/Cd 1— y Mg y Te quantum wells (QWs). To explain these polarization properties, the processes that lead to a dynamical equilibrium among trions, excitons and electron gas must be taken into account. This is in contrast to absorption experiments where the polarization of charged excitons is governed only by the occupation of spin‐split conduction band states. We develop a rate equation model involving characteristic times as obtained from time resolved experiments. The model is capable to describe adequately our PL polarization results.