Vorschau |
PDF, Englisch
Download (39MB) | Nutzungsbedingungen |
Abstract
The ultrafast carrier and lattice dynamics in polar and ferromagnetic semiconductors were investigated using optical and X-ray free-electron laser. In polar semiconductor Li-doped CdTe, the influence of Coulomb screening and phonon-plasmon coupling in carrier and lattice dynamics was observed by means of a time resolved pump-probe reflectivity technique. When doping polar semiconductors with magnetic atoms, magnetic interactions are introduced, e.g., in ferromagnetic semiconductor Ga$_{1-x}$Mn$_{x}$As, the Mn doped GaAs. By applying the novel X-ray free-electron laser radiation, delivered by the Linac Coherent Light Source (LCLS), the time resolved X-ray diffraction was measured, which directly reveals the interplay between the laser excited carriers, acoustic phonon modes and spin order. Simultaneously, the evolution of hole quasi Fermi-level as a function of time and temperature was measured by the resonant X-ray emission spectroscopy.
Dokumententyp: | Dissertation |
---|---|
Erstgutachter: | Schlichting, Prof. Dr. Ilme |
Tag der Prüfung: | 20 Dezember 2012 |
Erstellungsdatum: | 16 Jan. 2013 09:20 |
Erscheinungsjahr: | Januar 2013 |
Institute/Einrichtungen: | Zentrale und Sonstige Einrichtungen > Max-Planck-Institute allgemein > MPI fuer Med. Forschung |
DDC-Sachgruppe: | 530 Physik |