Band structure and insulating states driven by Coulomb interaction in twisted bilayer graphene

被引：112

作者：

Cea, Tommaso ^{[1
]}

Guinea, Francisco ^{[1
,2
]}

机构：

[1] Imdea Nanosci, Faraday 9, Madrid 28015, Spain

[2] Donostia Int Phys Ctr, Paseo Manuel de Lardizabal 4, San Sebastian 20018, Spain

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 04期

关键词：

SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.102.045107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We analyze the phase diagram of twisted graphene bilayers near a magic angle. We consider the effect of the long-range Coulomb interaction, treated within the self-consistent Hartree-Fock approximation, and we study arbitrary band fillings. We find a rich phase diagram, with different broken symmetry phases, although they do not show necessarily a gap at the Fermi energy. There are nontrivial effects of the electrostatic potential on the shape and the gaps of the bands in the broken symmetry phases. The results suggest that the nonsuperconducting broken symmetry phases observed experimentally are induced by the long-range exchange interaction.

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页数：6

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