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• W2028931172 abstract "The influence of hole localization on the magnetoluminescence emission of a two-dimensional electron gas present in a semiconductor modulation-doped heterojunction is studied. For holes localized at a dilute delta layer of Be acceptors at large distances from the interface a narrow emission line is observed due to a Fermi-edge singularity involving electrons in the second confined state. The evolution of this line in a perpendicular magnetic field shows common characteristics with previous results in high mobility samples not containing Be, which are indicative of a general behavior of the electron system in heterojunctions involving localized holes. At filling factor 2 the emission intensity is abruptly transferred to the recombination of electrons in the lowest Landau level with free valence holes, irrespective of the presence of Be. The abruptness of this transition, which is also observed in some samples at filling factor 1, reveals a coherent change in the electron system over a macroscopic sample area. The new optical emission shows marked deviations with respect to the single-particle behavior, which are tentatively interpreted as the formation of a complex state involving a free photocreated hole and the electron system. This complex unbinds when the Fermi level crosses the mobility edge." @default.
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• W2028931172 date "2004-10-20" @default.
• W2028931172 modified "2023-10-03" @default.
• W2028931172 title "Free versus localized hole magnetophotoluminescence in semiconductor heterojunctions near integer filling factors" @default.
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• W2028931172 doi "https://doi.org/10.1103/physrevb.70.155314" @default.
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