Identifying Dirac cones in carbon allotropes with square symmetry

Journal Article · Thu Nov 14 00:00:00 EST 2013 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4828861· OSTI ID:22251502

Wang, Jinying ^[1]; Huang, Huaqing; Duan, Wenhui ^[2]; Liu, Zhirong ^[1]

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1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (China)
2. Department of Physics, Tsinghua University, Beijing 100084 (China)

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.

• OSTI ID: 22251502
• Journal Information: Journal of Chemical Physics, Vol. 139, Issue 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CHIRALITY
FERMI LEVEL
FERMIONS
GRAPHENE
PARTICLES
TWO-DIMENSIONAL CALCULATIONS