Abstract
The electron-phonon interaction and related transport properties are investigated in monolayer silicene and MoS by using a density functional theory calculation combined with a full-band Monte Carlo analysis. In the case of silicene, the results illustrate that the out-of-plane acoustic phonon mode may play the dominant role unlike its close relative, graphene. The small energy of this phonon mode, originating from the weak bonding between Si atoms, contributes to the high scattering rate and significant degradation in electron transport. In MoS, the longitudinal acoustic phonons show the strongest interaction with electrons. The key factor in this material appears to be the valleys located between the and points in the first Brillouin zone as they introduce additional intervalley scattering. The analysis also reveals the potential impact of extrinsic screening by other carriers and/or adjacent materials. Finally, the effective deformation potential constants are extracted for all relevant intrinsic electron-phonon scattering processes in both materials.
3 More- Received 22 January 2013
DOI:https://doi.org/10.1103/PhysRevB.87.115418
©2013 American Physical Society