A fully self-consistent treatment for gap generation and Coulomb screening in excitonic insulators is presented. The method is based on the equations of motion for the relevant dynamical variables combined with a variational approach. Applying the theory for a model system of bilayer graphene, an excitonic ground state with a gap exceeding 10 meV is predicted.
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 2013|
|MoE publication type||A1 Journal article-refereed|
- 2D materials
- many-body theory