Impact ionization dynamics in small band-gap 2D materials from a coherent phonon mechanism
作者： Stephan Michael , Hans Christian Schneider
DOI: 10.1103/PHYSREVB.100.035431
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摘要: We study theoretically the role of carrier multiplication due to impact ionization after an ultrafast optical excitation in a model system quasi-two dimensional material with small band gap. As mechanism for photo-induced gap narrowing we use coherent phonons, which mimics quenching insulator phase. discuss importance response, and investigate interplay between dynamics. Our allows us compare recent experiments identify signatures typical electronic distribution curves as measured by time-resolved photoemission spectroscopy. In particular influence shape bands on respective contributions dynamics curves.
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