Topological properties of the bond-modulated honeycomb lattice
arXiv:1410.3411 · doi:10.1103/PhysRevB.91.115112
Abstract
We study the combined effects of lattice deformation, e-e interaction and spin-orbit coupling in a two-dimensional (2D) honeycomb lattice. We adopt different kinds of hopping modulation--generalized dimerization and a Kekule distortion--and calculate topological invariants for the non-interacting system and for the interacting system. We identify the parameter range (Hubbard U, hopping modulation, spin-orbit coupling) where the 2D system behaves as a trivial insulator or Quantum Spin Hall Insulator.
8 pages, 4 figures: discussion improved, typos corrected, references updated. Matches version published in PRB
References in corpus (10)
- Topological Insulators with Inversion Symmetry
- A tight-binding approach to uniaxial strain in graphene
- Time Reversal Polarization and a Z_2 Adiabatic Spin Pump
- Correlated Topological Insulators with Mixed Valence
- Variational cluster approach to correlated electron systems in low dimensions
- Zero modes of tight binding electrons on the honeycomb lattice
- Simplified topological invariants for interacting insulators
- Correlation effects in two-dimensional topological insulators
- Topological antiferromagnetic phase in a correlated Bernevig-Hughes-Zhang model
- Topological invariants in interacting Quantum Spin Hall: a Cluster Perturbation Theory approach