Formation of infrared solitons in graphene ensemble under Raman excitation Chunling Ding, Rong Yu, Xiaoxue Yang, Duo Zhang and Mingju Huang Eur. Phys. J. D, 69 11 (2015) 263 Published online: 26 November 2015 DOI: 10.1140/epjd/e2015-60233-2