Fig. 3From: HOT Graphene and HOT Graphene Nanotubes: New Low Dimensional Semimetals and Semiconductors(a) Different tubes are denoted by symbol (l,m) n, with (l,m) stands for rolling direction based on unit vector a and b, and n for the number of tube diameter units; (b) diameter unit on the (1,0) direction; (c) diameter unit on the (0,1) direction; (d) geometric structure of a (1,0)6 HOT graphene nanotube; (e) geometric structure of a (0,1)4 HOT graphene nanotubeBack to article page