Phonon-Mediated Exciton Relaxation in Two-Dimensional Semiconductors: Selection Rules and Relaxation Pathways
Xiao-Wei Zhang,
Kaichen Xie,
En-Ge Wang
et al.
Abstract:Exciton−phonon coupling (ExPC) is crucial for energy relaxation in semiconductors, yet the first-principles calculation of such coupling remains challenging, especially for two-dimensional (2D) systems. Here, an accurate method for calculating ExPC is developed and applied in exciton relaxation problems in monolayer WSe 2 . Considering the interplay between the exciton wave functions and electron−phonon coupling (EPC) matrix elements, we find that ExPC shows selection rules distinct from the ones of EPC. By em… Show more
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