Exciton dynamics in a single layer MoS2

In a low dimensional semiconductor, exciton plays a crucial role in the optical property. Recently, a single layer of MoS2 has attracted significant attention due to its unique excitonic features. For example, exciton in MoS2 is predicted to have order of magnitude larger binding energy than conventional direct band gap material. For deeper understanding on such properties, however, it is important to understand how exciton is formed and decays in time domain. Our work on exciton dynamics in MoS2 by pump probe spectroscopy will be presented with control of both power and wavelength.