C3-symmetric and certain C2-symmetric pi-vacancy motifs in 3n x 3n graphene superlattices pin Dirac cones at Gamma to open band gaps, while others allow shifts.
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Guidelines for band gap opening in graphene superlattices with periodic {\pi}-vacancy distribution
C3-symmetric and certain C2-symmetric pi-vacancy motifs in 3n x 3n graphene superlattices pin Dirac cones at Gamma to open band gaps, while others allow shifts.