Zigzag graphene nanoribbons without inversion symmetry
arXiv:1107.3982 · doi:10.1103/PhysRevB.84.115434
Abstract
Graphene on a substrate will suffer an inversion-symmetry-breaking (ISB) lattice potential. Taking electron-electron interaction into account, we study in this paper the possibility of half-metallicity and noncollinear (NC) magnetic phase for graphene zigzag nanoribbons without inversion symmetry. At half-filling it is found that half-metallic(HM) state can be achieved at an intermediate value of the ISB potential due to its competition with the electron-electron interaction. Away from half-filling, the phase diagrams of doping versus ISB potential for different ribbon width are given, where the regimes for the HM states and NC magnetic state are clearly indicated and discussed. For ribbons with perfect edges, we predict a topological transition between two HM states with different magnetic structures, which is accompanied by an abrupt transition of electrical conductance along the ribbon from to .
7 pages, 7 figures
References in corpus (25)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Energy Band Gap Engineering of Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Substrate-induced band gap opening in epitaxial graphene
- Graphane: a two-dimensional hydrocarbon
- Properties of Graphene: A Theoretical Perspective
- Half-metallic ferromagnets: From band structure to many-body effects
- Graphene Antidot Lattices - Designed Defects and Spin Qubits
- Scanning Tunneling Spectroscopy of Graphene on Graphite
- Finite size effects of helical edge states in HgTe/CdTe quantum wells
- Intrinsic Half-Metallicity in Modified Graphene Nanoribbons
- Edge states in Graphene: from gapped flat band to gapless chiral modes
- Origins of anomalous electronic structures of epitaxial graphene on silicon carbide
- Will Zigzag Graphene Nanoribbon Turn to Half Metal under Electric Field?
- Half-metallic graphene nanodots
- Metal to insulator transition in epitaxial graphene induced by molecular doping
- Hidden multiferroic order in graphene zigzag ribbons
- Character of electronic states in graphene antidot lattices: Flat bands and spatial localization
- A Two-Dimensional Carbon Semiconductor
- Spontaneous persistent currents in magnetically ordered graphene ribbons
- Magneto-electric coupling in zigzag graphene nanoribbons
- Theory of Electro-Optical Properties of Graphene Nanoribbons
- Controlling doping in graphene through a SiC substrate: A first-principles study
- Gap opening in topological-defect lattices in graphene