Twisted helical armchair graphene nanoribbons: mechanical and electronic properties Rajesh Thakur, P. K. Ahluwalia, Ashok Kumar, Munish Sharma and Raman Sharma Eur. Phys. J. B, 94 5 (2021) 99 Published online: 08 May 2021 DOI: 10.1140/epjb/s10051-021-00102-1