Spatial and temporal speckle correlations in the coherent excitonic emission
The recently developed speckle analysis allows new possibilities for the spectroscopy of localized electronic excitations in solids as e.g. localized excitons.
Apart from the determination of the coherence decay, speckle correlations under variation of external parameters will be introduced as a very sensitive method. Magnetic and electric fields, strain, and excitation direction will be used as such parameters. In addition to the time-resolved speckle analysis, the frequency resolved counterpart will be improved and used for the correlation analysis as well.
In parallel, the microscopic model (density matrix for excitonic processes) will be
worked out in further detail. Speckle correlations will be found in higher expectation values which calls for a systematic theory. In this respect, the available methods for the statistical treatment of disordered systems will be extended. The close collaboration between theory and experiment will be strenghtened in order to demonstrate the power of the new correlation spectroscopy.
Zimmermann, Roland Prof. i. R. Dr. rer. nat. habil. (Details) (Theoretical Physics / Theory of Semiconductors)
Financer
DFG Individual Research Grant
Duration of project
Start date: 01/2002
End date: 01/2003
