Graphene superlattice with periodically modulated Dirac gap
arXiv:1208.2567 · doi:10.1103/PhysRevB.86.205422
Abstract
Graphene-based superlattice (SL) formed by a periodic gap modulation is studied theoretically using a Dirac-type Hamiltonian. Analyzing the dispersion relation we have found that new Dirac points arise in the electronic spectrum under certain conditions. As a result, the gap between conduction and valence minibands disappears. The expressions for the position of these Dirac points in -space and threshold value of the potential for their emergence were obtained. At some parameters of the system, we have revealed interface states which form the top of the valence miniband.
5 pages, 4 figures, accepted to Physical Review B
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- Transport in graphene nanostructures with spatially modulated gap and potential
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- Tunable anisotropic behaviors in phosphorene under periodic potentials in arbitrary directions
- Effect of one-dimensional superlattice potentials on the band gap of two-dimensional materials
- Effect of weak disorder on delocalization properties of gapped graphene superlattices
- Band structures and contact points in phosphorene superlattice
- Electronic states in a superlattice consisting of alternating strips of single-layer and bilayer graphene
- The massless Dirac-Weyl equation with deformed extended complex potentials
- Magnetic Bloch bands and Weiss oscillations in Dirac mass superlattices