Lattice gauge theory model for graphene
Lattice gauge theory model for graphene
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石墨烯晶格规范理论模型
DOI：
10.1103/physrevb.82.121418
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发表时间：
2010
影响因子：
3.7
通讯作者：
M. Porta
中科院分区：
文献类型：
--
作者：
A. Giuliani;V. Mastropietro;M. Porta
利用格点规范理论模型研究了半填充石墨烯中电子-电子电磁相互作用的影响。通过使用精确的重整化群方法和晶格沃德恒等式，我们表明，电磁相互作用放大了与凯库勒畸变和电荷密度波相关的激子配对的响应。通过推导一个精确的非BCS能隙方程，研究了电子排斥对Peierls-Kekule不稳定性的影响，发现电子间强的电磁相互作用促进了晶格的自发畸变和能隙的打开.
The effects of the electromagnetic (em) electron-electron interactions in half-filled graphene are investigated in terms of a lattice gauge theory model. By using exact renormalization group methods and lattice Ward identities, we show that the em interactions amplify the responses to the excitonic pairings associated to a Kekule distortion and to a charge-density wave. The effect of the electronic repulsion on the Peierls-Kekule instability, usually neglected, is evaluated by deriving an exact non BCS gap equation, from which we find evidence that strong em interactions among electrons facilitate the spontaneous distortion of the lattice and the opening of a gap.