论文标题
扭曲双层石墨烯中库仑相互作用驱动的带结构和绝缘状态
Band structure and insulating states driven by the Coulomb interaction in twisted bilayer graphene
论文作者
论文摘要
我们在魔术角附近分析了扭曲的石墨烯双层的相图。我们考虑远程库仑相互作用的效果，在自我一致的hartree-fock近似中处理，并研究任意带填充物。我们发现了一个丰富的相图，具有不同的断裂对称阶段，尽管Tehy不一定显示在费米能量上的差距。静电势对破碎的对称相中的频带的形状和间隙存在非微不足道的影响。结果表明，实验观察到的非超导损坏的对称阶段是由远程交换相互作用引起的。
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 tehy do not show necessarily a gap at the Fermi energy. There are non trivial effects of the electrostatic potential on the shape and the gaps of the bands in the broken symmetry phases. The results suggest that the non superconducting broken symmetry phases observed experimentally are induced by the long range exchange interaction.
