Spatial control of carrier capture in two-dimensional materials: Beyond energy selection rules

Artikel i vetenskaplig tidskrift, 2018

© 2018 American Physical Society. The carrier capture from a two-dimensional transition metal dichalcogenide monolayer into a quasi-zero-dimensional potential is a decisive process to exploit these remarkable materials as, e.g., single-photon sources. Here, we study theoretically the phonon-induced carrier capture in a MoSe2 monolayer using a Lindblad single-particle approach. Although one decisive control parameter of the capture efficiency is the energy selection rule, which links the energy of the incoming carriers to that of the final state via the emitted phonon, we show that additionally the spatiotemporal dynamics plays a crucial role. By varying the direction of the incoming carriers with respect to the orientation of the localized potential, we introduce a new control mechanism for the carrier capture: the spatial control.