Disappearance of the Dirac cone in silicene due to the presence of an electric field
arXiv:1403.0707 · doi:10.1088/1674-1056/23/3/037101
Abstract
Using the two-dimensional ionic Hubbard model as a simple basis for describing the electronic structure of silicene in the presence of an electric field induced by the substrate, we use the coherent-potential approximation to calculate the zero-temperature phase diagram and associated spectral function at half filling. We find that any degree of symmetry-breaking induced by the electric field causes the silicene structure to lose its Dirac fermion characteristics, thus providing a simple mechanism for the disappearance of the Dirac cone.
arXiv comment17pages, 8 figures
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- Quantum transport of Dirac fermions in selected graphene nanosystems away from the charge-neutrality point