Friday, October 19, 2012

1210.4923 (Vladimir Cvetkovic et al.)

Topology and symmetry breaking in ABC trilayer graphene    [PDF]

Vladimir Cvetkovic, Oskar Vafek
The effects of topology and electron-electron interactions on the phase diagram of ABC stacked trilayer graphene (TLG) at the neutrality point are investigated within a weak coupling renormalization group approach. We find that the leading instability of TLG with only a forward scattering density-density interaction is towards a mirror-breaking gapless state. Addition of a small, but finite back scattering favors gapped phases, allowing us to make connections to the existing experiments on TLG. We identify a fundamental symmetry difference between TLG and bilayer graphene (BLG) which is responsible for disfavoring nematic states in TLG under the same conditions that favor nematic states in BLG.
View original: http://arxiv.org/abs/1210.4923

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