Multidimensional spectroscopy techniques with high spectral and temporal resolution are instrumental for the experimental access to many-body interactions and energy migration pathways in functional materials and condensed matter systems. Here, we reveal the distinct many-body effects caused by excitons and free charge carriers in bulk semiconductors enabled by accessing the excitation spectral information. In addition, we precisely track the thermalization, cooling, and exciton formation of excited charge carriers at liquid helium temperature as a function of excess energy.
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Deckert et al. (2024) studied this question.
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