Congratulation Hyun Seok Lee's PRB paper acceptance!
Title: Identifying Multiexcitons in MoS2 Monolayers at Room Temperature
Authors: Hyun Seok Lee, Min Su Kim, Hyun Kim, and Young Hee Lee
Abstract: One of the unique featuresof atomically thin two-dimensional materialsis strong Coulomb interactions due to thereduced dielectric screening effect;this feature enables the study of many-body phenomena such as excitons, trions, and biexcitons. However, identification of biexcitonsremains unresolvedowing to their broad peak featureat room temperature. Here, we investigatemultiexcitonsin monolayer MoS2using both electrical and optical doping and identify the transition energies for each exciton. The binding energy of the assigned biexciton is twice that of the trion, in quantitative agreement with theoretical predictions. The biexciton population is predominantunder optical dopingbut negligibleunder electrical doping.The biexcitonpopulationisquadratically proportional to the exciton population, obeying the mass-action theory.Our results illustrate the stable formation of not only trions but also biexcitons due to strong Coulomb interaction even at room temperature; therefore, these results provide a deeper understanding of the complex excitonic behaviors in two-dimensional semiconductors.