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

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

2005-12-15

arxiv.org/abs/cond-mat/0512360v2

Phys. Rev. B 73, 214418 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures; extended version

Scientific paper

10.1103/PhysRevB.73.214418

We study the effects of long and short-range electron-electron interactions in a graphene bilayer. Using a variational wavefunction 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.

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