Absence of broken inversion symmetry state of electrons in bilayer graphene under charge density fluctuations

Details Absence of broken inversion symmetry state of electrons in bilayer graphene under charge density fluctuations Absence of broken inversion symmetry state of electrons in bilayer graphene under charge density fluctuations

2012-04-05

arxiv.org/abs/1204.1101v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures

Scientific paper

On a lattice model, we study the possibility of existence of broken inversion symmetry state (BISS) of electrons with long-range Coulomb interaction in bilayer graphene using both mean-field theory (MFT) and the renormalized-ring-diagram approximation (RRDA). RRDA takes into account the charge-density fluctuations beyond the mean field. While BISS at low temperature and low carrier concentration is predicted by MFT, we show here the state can be destroyed by the charge-density fluctuations. We also present a numerical algorithm for calculating the self-energy of electrons with the singular long-range Coulomb interaction on the lattice model.

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