Current induced forces in graphene nanoribbons

摘要

Current induced forces at atomic scale have proven to limit the stability and performance of nanoscale devices. In this work, we employed a semiempirical tight-binding model along with a generalized Hellmann-Feynman theorem to calculate "wind-forces" due to the flow of electric current. The developed model is applied to calculate these forces for pristine and defected armchair and zigzag graphene nanoribbons under different magnetic states. Special profile, dependence on the ribbon's width, and the effect of defects on the current induced forces are discussed. Transport calculations are followed by molecular dynamics simulations for evaluating atomic displacement and mechanical strains due to current induced forces. The results indicate the importance of including current induced forces for a careful analysis of two-dimensional based devices. Published under license by AIP Publishing.