Terahertz surface emission spectroscopy of layered MoS2 crystal: from surface optical rectification to ultrafast photocurrent

Terahertz (THz) radiation of layered molybdenum disulfide (MoS2) crystal under linear and circular polarized femtosecond laser excitations was observed, and the surface optical rectification, photocurrent surge, as well as the helicity dependent photocurrent were demonstrated.