چكيده به لاتين
In this Thesis, electronic transport of zigzag graphene, silicene and phosphorene is investigated by means of the nonequilibrium green function method and tight-binding model. For simplifying, zero temperature and coherent phas conduction are supposed. By considering ferromagnetic leads, spin tansport in FM/Normal/FM junction based on zigzag graphene, silicene and phosphorene is calculated and by using of conduction of parallel and anti-parallel configuration, magnetoresistance are achived. Also, effect of width and length of nanoribbons, vacancy, Anderson disorder and external electric field on conduction of zigzag graphene, silicene and phosphorene are investigated.
As results show, spin conduction has electron-hole symmetry in the junction based on zigzag graphene and silicene nanoribbons in absence of vertical electric field; while there isn't this kind of symmetry in zigzag phosphorene nanoribbons. For graphene and silicene nonoribbons, in the case of anti-parallel configuration and Fermi energies near the dirac point, conduction is zero; This leads to a 100% MR plateau and are corresponding to magnetoresistance plateau widths. However, for zigzag phosphorene nonoribbon and in the case of negative Fermi energies and near the dirac point, magnetoresistance plateau is 100% and has width as much as M. By increasing M, plateau width in all of the three nonoribbons is increas
