Dynamics of charge-transfer excitons in a transition metal dichalcogenide heterostructure
Ang Bian, Dawei He, Shengcai Hao, Yang Fu, Lu Zhang, Jiaqi He, Yongsheng Wang, Hui Zhao
Abstract
trilayer heterostructure. We observed a non-classical lateral diffusion process of charge-transfer excitons with a decreasing diffusion coefficient. This feature suggests that hot charge-transfer excitons with large kinetic energies are formed and their cooling process persists for about 100 ps. The long energy relaxation time of excitons in the trilayer compared to its monolayer components is attributed to the reduced carrier and phonon scattering due to the dielectric screening effect in the trilayer. Our results help develop an in-depth understanding of the dynamics of charge-transfer excitons in two-dimensional heterostructures.
Topics & Concepts
HeterojunctionExcitonTransition metalCharge (physics)Chemical physicsMaterials scienceMetalDynamics (music)NanotechnologyCondensed matter physicsOptoelectronicsChemistryPhysicsQuantum mechanicsMetallurgyCatalysisBiochemistryAcoustics2D Materials and ApplicationsPerovskite Materials and ApplicationsLuminescence and Fluorescent Materials