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

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

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 significantl...

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Hauptverfasser: Wagenhuber, Klaus, Shalygin, Vadim, Niedermeier, Ulrich, Gerl, Christian, Wegscheider, Werner, Korn, Tobias, Schulz, Robert, Schuller, Christian, Ivchenko, Eugeniyus L, Ganichev, Sergey
Format: Tagungsbericht
Sprache:eng
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Zusammenfassung: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. Time-resolved pump-probe and Faraday-rotation experiments give an additional information concerning the exciton and trion resonant photoexcitation.
ISSN:0094-243X
DOI:10.1063/1.2729954