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Effect of electric field and magnetic field on spin transport in bilayer graphene armchair nanoribbons: A Monte Carlo simulation study

Author:
Akshaykumar Salimath  Bahniman Ghosh  


Journal:
Current Applied Physics


Issue Date:
2014


Abstract(summary):

Abstract In this article we study the effect of external magnetic field and electric field on spin transport in bilayer armchair graphene nanoribbons (GNR) by employing semiclassical Monte Carlo approach. We include D'yakonov-Perel' (DP) relaxation due to structural inversion asymmetry (Rashba spin-orbit coupling) and Elliott-Yafet (EY) relaxation to model spin dephasing. In the model we neglect the effect of local magnetic moments due to adatoms and vacancies. We have considered injection polarization along z -direction perpendicular to the plane of graphene and the magnitude of ensemble averaged spin variation is studied along the x -direction which is the transport direction. To the best of our knowledge there has been no theoretical investigation of the effects of external magnetic field on spin transport in graphene nanoribbons. This theoretical investigation is important in order to identify the factors responsible for experimentally observed spin relaxation length in graphene GNRs. Highlights • We employ Monte Carlo simulation technique to model spin transport in bilayer GNR. • We study effect of external electric and magnetic field on spin relaxation length. • SRL increases with increased width for β- and γ acGNR while it is nearly same for all widths for α –GNR. • SRL decreases in presence of external magnetic field due to the precession and suppression of spin. • SRL decreases with increasing electric field due to increased scattering rate.


Page:
1526-1526


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