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High spin polarization of optically-oriented trions in p-doped GaAs-AlGaAs quantum wells

Wagenhuber, Klaus ; Shalygin, Vadim ; Niedermeier, Ulrich ; Gerl, Christian ; Wegscheider, Werner ; Korn, Tobias ; Schulz, Robert ; Schüller, Christian ; Ivchenko, Eougenious ; Ganichev, Sergey


We performed cw-photoluminescence (PL) measurements on a 15 nm wide p-doped Al0.3Ga0.7As-GaAs-Al0.3Ga0.7As quantum well structure at low temperatures. By irradiating the sample with circularly polarized light and analyzing the degree of circular polarization of the PL signal, we found a significantly higher degree of spin polarization for charged excitons (trions) than for neutral excitons. ...


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