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Title: Identifying Dirac cones in carbon allotropes with square symmetry

A theoretical study is conducted to search for Dirac cones in two-dimensional carbon allotropes with square symmetry. By enumerating the carbon atoms in a unit cell up to 12, an allotrope with octatomic rings is recognized to possess Dirac cones under a simple tight-binding approach. The obtained Dirac cones are accompanied by flat bands at the Fermi level, and the resulting massless Dirac-Weyl fermions are chiral particles with a pseudospin of S = 1, rather than the conventional S = 1/2 of graphene. The spin-1 Dirac cones are also predicted to exist in hexagonal graphene antidot lattices.
Authors:
 [1] ; ;  [2] ;  [1] ;  [3]
  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (China)
  2. Department of Physics, Tsinghua University, Beijing 100084 (China)
  3. (BNLMS), Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
22251502
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 139; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; CHIRALITY; FERMI LEVEL; FERMIONS; GRAPHENE; PARTICLES; TWO-DIMENSIONAL CALCULATIONS