In this work, the effect of electron-electron scattering on spin transport in single layer graphene is studied using semi-classical Monte Carlo simulation. The D’yakonov-P’erel mechanism is considered for spin relaxation. It is found that electron-electron scattering causes spin relaxation length to decrease by 35% at 300 K. The reason for this decrease in spin relaxation length is that the ensemble spin is modified upon an e-e collision and also e-e scattering rate is greater than phonon scattering rate at room temperature, which causes change in spin relaxation profile due to electron-electron scattering.

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Theoretical study of the effect of electron-electron scattering on spin transport in trilayer graphene is studied in this paper using semiclassical Monte Carlo simulation. We have taken into consideration both ABA and ABC stacking of trilayer graphene. We have used both D'yakonov-Perel (DP) and Elliot-Yafet (EY) spin relaxation mechanisms in our simulation. We observed that spin relaxation length (SRL) in ABA stacking decreases by 40% on including e-e scattering while in case of ABC stacking, SRL decreases by only 6% at room temperature. The reason for this decrease in SRL is that ensemble spin is modified upon an e-e collision and also e-e scattering rate is greater than phonon scattering rate which causes decrease in SRL.

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