Work

Electron-electron interactions and the phase diagram of a graphene bilayer

Year: 2006

Type: article

Abstract: We study the effects of long and short-range electron-electron interactions in a graphene bilayer. Using a variational wave function technique we show that in the presence of long-range Coulomb interactions the clean bilayer is always unstable to electron and hole pocket formation with a finite ferromagnetic polarization. Furthermore, we argue that short-range electron-electron interactions lead to a staggered orientation of the ordered ferromagnetic moment in each layer (that is, $c$-axis antiferromagnetism). We also comment on the effects of doping and trigonal distortions of the electronic bands.

Source: Physical Review B

DOI: 10.1103/physrevb.73.214418

Authors: Johan Nilsson, A. H. Castro Neto, N. M. R. Peres, F. Guinea

Institutions: Boston University, University of Minho, Instituto de Ciencia de Materiales de Madrid

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, European Commission, Ministerio de Economía y Competitividad, Division of Materials Research

Award: Disordered Critical Quantum Magnetic Systems