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Universal Rule on Chirality‐Dependent Bandgaps in Graphene Antidot Lattices
Author(s) -
Liu Xiaofei,
Zhang Zhuhua,
Guo Wanlin
Publication year - 2013
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201202988
Subject(s) - chirality (physics) , graphene , band gap , materials science , nanotechnology , condensed matter physics , optoelectronics , physics , quantum mechanics , chiral symmetry , nambu–jona lasinio model , quark
Graphene with periodically patterned antidots has attracted intense research attention as it represents a facile route to open a bandgap for graphene electronics. However, not all graphene antidot lattices (GALs) can open a bandgap and a guiding rule is missing. Here, through systematic first‐principles calculations, it is found that bandgaps in triangular GALs are surprisingly well defined by a chirality vector R = n a 1 + m a 2 connecting two neighboring antidots, where a 1 and a 2 are the basis vectors of graphene. The bandgap opens in the GALs with ( n ‐ m )mod3 = 0 but remains closed in those with ( n ‐ m )mod3 = ±1, reminiscent of the gap‐chirality rule in carbon nanotubes. Remarkably, the gap value in GALs allows ample modulation by adjusting the length of chirality vectors, shape and size of the antidots. The gap–chirality relation in GALs stems from the chirality‐dependent atomic structures of GALs as revealed by a super‐atom model as well as Clar sextet analyses. This chirality‐dependent bandgap is further shown to be a generic behavior in any parallelogram GAL and thus serves as an essential stepping stone for experimenters to realize graphene devices by antidot engineering.