Manipulation of slow and superluminal light based on a graphene nanoribbon resonator Hua-Jun Chen, Bian-Bian Sun, Hong-Wei Wu and Xian-Wen Fang Eur. Phys. J. D, 71 3 (2017) 67 Published online: 21 March 2017 DOI: 10.1140/epjd/e2017-70595-x