Time-resolved two-photon photoemission spectroscopy of semiconductor bulk states
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Time-resolved two-photon photoemission spectra (2PPE) are modeled using the Heisenberg equations of motion, wherein electron relaxation (thermalization) is treated phenomenologically. Energy dispersion is incorporated for initial, intermediate, and final states in the model calculations. The question of whether time-resolved 2PPE spectra can help to determine the electron distribution in intermediate states (such as conduction band states), and thereby enable the extraction of their temperature, is the focus of this work. By exploring different types of energy dispersion for the final states and by varying the pump and probe energies, the study indicates that 2PPE spectra provide qualitative insight into the process of hot-electron thermalization and cooling, but do not directly yield quantitative information, such as the actual distribution or temperature.
KeywordsModel Calculation Conduction Band Intermediate State Energy Dispersion Quantitative Information
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