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Magneto Photoluminescence and Ultrafast Spectroscopy on High-Mobility Two-Dimensional Electron Systems

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Magneto Photoluminescence and Ultrafast Spectroscopy on High-Mobility Two-Dimensional Electron Systems

Patrick Schröter (Autor)

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ISBN-13 (Printausgabe) 3865372317
ISBN-13 (Printausgabe) 9783865372314
ISBN-13 (E-Book) 9783736912311
Sprache Deutsch
Seitenanzahl 124
Auflage 1 Aufl.
Band 0
Erscheinungsort Göttingen
Promotionsort Hamburg
Erscheinungsdatum 20.09.2004
Allgemeine Einordnung Dissertation
Fachbereiche Physik
Beschreibung

In this work, the focus of the time-resolved experiments is on the modulationdoped single-well structures. These are of high-quality but have the disadvantage that they only exhibit weak Four Wave Mixing signals. Up to now, only results on the doped multiple well structures exist. A main part of the Four Wave Mixing experiments focuses on the two-dimensional electron gas at filling
factor ν = 1. With increasing magnetic field a step-like increase of the dephasing time at ν = 1 is found for the light-hole like transition. Moreover, it is deduced that the dephasing time not only depends on the electron states but also on the coupling between the hole states. A sample structure is introduced, specially designed for our time-resolved experiments, that provides for weak signals the necessary prealignment of the setup. On these samples, also circular polarization resolved measurements could be performed. In these experiments, no signature of filling factor ν = 1 is resolved in the dephasing time. From the dephasing times of the excitons, it is concluded that the charged exciton is probably not localized in our sample. Moreover, an interchanged beating pattern of the neutral excitons with the triplet state is observed.