Electronic transport properties of WS₂ using ensemble Monte Carlo method

The electronic transport characteristics of tungsten disulfide (WS 2 ) sheets are studied using the ensemble Monte Carlo technique in the presence of intrinsic scattering mechanisms only. The transport properties of the material are obtained in a two-valley model where intra- and inter-valley scatterings are considered in K and Q valleys. The velocity overshoot effect is observed for some applied field values. Negative differential phenomena are seen for some values of the energy difference between K and Q valleys ( <?CDATA Δ EKQ?> Δ E K Q ), therefore <?CDATA Δ EKQ?> Δ E K Q and the effective mass of carriers in the Q valley has a critical role in the transport and mobility characteristics of WS 2 . The mobility of carriers is calculated as a function of temperature and the results are compatible with some existing theoretical and experimental predictions.