2018/03/14 by Sabrine Ayari, Adlen Smiri, Aida Hichri +5
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Chalcogenide Semiconductor Thin Films #Condensed matter physics #Context (archaeology) #Exciton #Laser #Materials science #Monolayer #Nanotechnology #Optics #Optoelectronics #Perovskite Materials and Applications #Photoluminescence #Physics #Picosecond #Quantum mechanics #Radiative transfer #Spectral line #Spectroscopy #Spontaneous emission #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.98.205430
published as Phys. Rev. B 98, 205430 (2018) · arXiv admin note: text overlap with arXiv:1409.3996 by other authors
arxiv created 2018/03/14 · openalex publication_date 2018/11/30 · arxiv updated 2018/12/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Disorder derived from defects or local strain in monolayer transition-metal dichalcogenides (TMDs) can lead to a dramatic change in the physical behavior of the interband excitations, producing inhomogeneous spectral broadening and localization leading to radiative lifetime increase. In this study, we have modeled the surface disorder of a monolayer TMD sample through a randomized potential in the layer plane. We show that this model, applied to a monolayer of WSe2, allows us to simulate the spectra of localized exciton states as well as their radiative lifetime. In this context, we give an in depth study of the influence of the disorder potential parameters on the optical properties of these defects through energies, density of states, oscillator strengths, photoluminescence (PL) spectroscopy, and radiative lifetime at low temperature (4 K). We demonstrate that localized excitons have a longer emission time than free excitons, in the range of tens of picoseconds or more, the radiative decay time depending strongly on the disorder parameter and dielectric environment. Finally, in order to prove the validity of our model, we compare it to available experimental results of the literature.