Transition metal dichalcogenide monolayers in an ultrashort optical pulse: Femtosecond currents and anisotropic electron dynamics

We theoretically study the interaction of an ultrafast intense linearly polarized optical pulse with monolayers transition metal dichalcogenides (TMDCs). Such a strong redistributes electrons between bands and generates femtosecond currents during pulse. Due to large bandwidth incident pulse, this process is completely off-resonant. While in TMDCs time-reversal symmetry conserved, inversion broken these have axial along armchair direction but not zigzag one. Therefore, asymmetric TMDC monolayer both longitudinal, i.e., polarization, transverse, perpendicular direction, currents. result charge transfer through system. different materials show how transport depend on their parameters, such as lattice constant bandgap.