Giant frequency tunability enabled by external magnetic and a gate electric fields in graphene devices Hu, Xiang ; Huang, Qiuping ; Zhao, Yi ; Cai, Honglei ; Knize, Randy J. ; Lu, Yalin Abstract Publication: Optics Express Pub Date: March 2016 DOI: 10.1364/OE.24.006606 Bibcode: 2016OExpr..24.6606H