2017/07/01 by V. Apinyan, Vardan Apinyan, T. K. Kopeć +1
Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Asymmetry #Bilayer graphene #Chemical and Physical Properties of Materials #Coulomb #Density of states #Exciton #Graphene research and applications #Local density of states #Pairing #Phase transition #cond-mat.str-el
paper · pdf · doi:10.1140/epjb/e2017-80130-8
published as Eur. Phys. J. B (2017) 90, 130 · 13 pages, 11 figures
openalex publication_date 2017/07/01 · openalex created_date 2017/07/14 · arxiv created 2017/12/13 · arxiv updated 2017/12/14 · openalex updated_date 2026/08/05
In the present paper, we consider the excitonic effects on the single particle normal density of states (DOS) in the bilayer graphene (BLG). The local interlayer Coulomb interaction is considered between the particles on the non-equivalent sublattice sites in different layers of the BLG. We show the presence of the excitonic shift of the neutrality point, even for the noninteracting layers. Furthermore, for the interacting layers, a very large asymmetry in the DOS structure is shown between the particle and hole channels. At the large values of the interlayer hopping amplitude, a large number of DOS at the Dirac’s point indicates the existence of the strong excitonic coherence effects between the layers in the BLG and the enhancement of the excitonic condensation. We have found different competing orders in the interacting BLG. Particularly, a phase transition from the hybridized excitonic insulator phase to the coherent condensate state is shown at the small values of the local interlayer Coulomb interaction.