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Type-I and type-II Dirac fermions in graphene with nitrogen-molecule line defects
- Publication Year :
- 2016
-
Abstract
- Recently, type-II Dirac fermions characterized by strongly titled Dirac cones have been proposed. The new fermions exhibit unique physical properties different from the type-I Dirac fermions in graphene, and thus attract tremendous attentions. Up to date, all type-II fermions are only found in the heavy compounds with strong spin obit coupling. Here, we propose that both type-I and type-II Dirac fermions can exist in the graphene embedding nitrogen-molecule line defects (NMLDs). While the types of Dirac fermions are determined by the size W of graphene nanoribbons between the line defects. By comparing the two types of Dirac fermions, their different physical properties and originations are revealed directly. Remarkably, the type-I Dirac points induce one Fermi arc corresponding to edge states along the armchair direction, while the type-II Dirac points induce two Fermi arcs corresponding to two sets of edge states along the zigzag direction. These results not only expand our views on the Dirac fermions in two-dimensional structures, but also extend their applications in electronics.
- Subjects :
- Chemical Physics (physics.chem-ph)
Condensed Matter::Quantum Gases
Condensed Matter - Materials Science
High Energy Physics::Lattice
Physics - Chemical Physics
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Computational Physics (physics.comp-ph)
Physics - Computational Physics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....ddf616bb69dfb256776473ca8cb204cb