Giant and dynamically tunable plasmonic circular dichroism in graphene ribbons and Z-shaped metal metamaterialsLi Hu, Fayin Cheng, Yuxia Tang and Hongjian WangEur. Phys. J. B, 94 1 (2021) 8DOI: https://doi.org/10.1140/epjb/s10051-020-00033-3