Influence of electron-electron scattering on spin relaxation length in single and bilayer graphene

Theoretical study of influence of electron-electron scattering on spin relaxation length in single layer graphene (SLG) and bilayer graphene (BLG) is done using ensemble semi classical Monte Carlo simulation. The comparison is made by including electron-electron interactions with electron-phonon interactions (acoustic and optical). The D´yakonov-Perel (DP) and Elliot-Yafet (EY) spin relaxation mechanisms are utilized in the Monte Carlo routines. The results are simulated with varying temperatures to show that e-e scattering holds significant importance as a scattering mechanism at low temperatures and gradually loses its importance in as we reach room temperature and above. We report highly contrasting effect of e-e scattering on SLG and BLG.