The role of the Rashba coupling in spin-current of monolayer gapped graphene Kobra Hasanirokh, Jafar Azizi, Arash Phirouznia and Hakimeh Mohammadpour Eur. Phys. J. B, 87 4 (2014) 95 Published online: 23 April 2014 DOI: 10.1140/epjb/e2014-40613-8