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- W822474800 abstract "For several years, the technological potential of self-organized grown quantum dots (QD) has been known. Their usage as an e ective light source or memory requires the precise prediction of their electronic properties. Hence, this report will study InAs quantum dots at GaAs substrate. After relaxing the atomic positions with a many body potential of Abell-Terso type, I calculated the electronic structure using the Tight-Binding method which is reasonable for large systems. During the investigation of wavefunctions depend on the shape, size and temperature, the impact of strain showed up as the main reason for the p-splitting. Typically at QDs (relative to lateral dimensions) are grown, therefore the energy of bound states depends mostly on their height. The crystal's orientation had a strong impact on the wavefunctions. Moreover, the understanding of STS experiments, which inspected the connection between shape and wavefunction, is better now. Because of the possible simultaneous occupation of semiconductor quantum dots with an electron and a hole, there is a dipole moment of the exciton (due to their di erent behaviour inside the QD). This is a further experimental access to inner details of the QD. I ascertained the interplay of composition pro le and dipole moment. The force caused by additional potentials (piezoelectricity, outer homogen and inhomogen electrical elds) was also an subject of my inquiries. To conclude, I executed kMC simulations, to better apprehend the annealing experiments. I was able to explain the narrowing of the PL peak width better. Furthermore I showed a rami cation of the strain eld to the di usion development (and the following electronic properties)." @default.
- W822474800 created "2016-06-24" @default.
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- W822474800 date "2008-06-23" @default.
- W822474800 modified "2023-09-27" @default.
- W822474800 title "Tight-Binding Simulationen von InAs/GaAs Quantenpunkten" @default.
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- W822474800 doi "https://doi.org/10.14279/depositonce-1907" @default.
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