Disappearance of the Dirac cone in silicene due to the presence of an electric field

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.

17pages, 8 figures

References in corpus (6)

• The electronic properties of graphene
• Quantum spin-liquid emerging in two-dimensional correlated Dirac fermions
• Absence of a Spin Liquid Phase in the Hubbard Model on the Honeycomb Lattice
• Interacting Dirac Fermions on Honeycomb Lattice
• Dynamical Mean Field Study of The Dirac Liquid
• Finite temperature semimetal-insulator transition on the honeycomb lattice

Cited by in corpus (4)

• Interaction-induced metallic state in graphene on hexagonal boron nitride
• Site-selective insulating phase in twisted bilayer Hubbard model
• Mott transition in the Hubbard model on anisotropic honeycomb lattice with implications for strained graphene: Gutzwiller variational study
• Quantum transport of Dirac fermions in selected graphene nanosystems away from the charge-neutrality point