Ultrafast transient sub-bandgap absorption of monolayer MoS2

Abstract

Photonics: Lighting the way to new photonic and optoelectronic applications Light–matter interactions in two-dimensional (2D) materials are of interest for applications such as lasers and solar cells, but these interactions drastically decrease below the bandgap. Recently, phenomena in the sub-bandgap region of 2D materials have attracted attention, but the physics behind is still elusive. A team of researchers, led by Zhipei Sun from Aalto University in Finland, has studied the near-infrared (NIR) transient absorption of monolayer molybdenum disulfide in the sub-bandgap region. The work has provided a better understanding of optical properties, excited carrier states, and carrier dynamics in the technologically important NIR region, paving the way for excited-state-based photodetectors and modulators made from 2D materials.