Comment on “Structural and Electronic Properties of $T$ Graphene: A Two-Dimensional Carbon Allotrope with Tetrarings”

A Comment on the Letter by Y. Liu et al., Phys. Rev. Lett. 108, 225505 (2012). The authors of the Letter offer a Reply.

Figure 1

(a) Atomic structures and (b) Brillouin zones for the primitive unit cell (black dashed frame) and $\sqrt{2}\times \sqrt{2}R45°$ supercell [red (or gray) solid frame] of planar $T$ graphene. (c),(d),(e) The band structures of planar $T$ graphene with the primitive unit cell and $\sqrt{2}\times \sqrt{2}R45°$ supercell, and buckled $T$ graphene, respectively. The band folding process is schematically depicted by the green arrow.