Spin-polarized transport in zigzag graphene nanoribbons adsorbing nonmagnetic atomic chain Ya Qin Wang, Yue E Xie, Zai Lan Zhang, Ye Zhang and Yuan Ping Chen Eur. Phys. J. B, 86 2 (2013) 34 Published online: 04 February 2013 DOI: 10.1140/epjb/e2012-30912-5