Identifying multiexcitons inMoS2monolayers at room temperature

• DOI: 10.1103/physrevb.93.140409
• Publication Date: 2016-04-19T18:08:26Z
• Authors: Hyun Seok Lee; Min Su Kim; Hyun Kim; Young Hee Lee
• Keywords: Trion; Biexciton

One of the unique features atomically thin two-dimensional materials is strong Coulomb interactions due to reduced dielectric screening effect; this feature enables study many-body phenomena such as excitons, trions, and biexcitons. However, identification biexcitons remains unresolved owing their broad peak at room temperature. Here, we investigate multiexcitons in monolayer $\mathrm{Mo}{\mathrm{S}}_{2}$ using both electrical optical doping identify transition energies for each exciton. The binding energy assigned biexciton twice that trion, quantitative agreement with theoretical predictions. population predominant under but negligible doping. quadratically proportional exciton population, obeying mass-action theory. Our results illustrate stable formation not only trions also interaction even temperature; therefore, these provide a deeper understanding complex excitonic behaviors semiconductors.