论文标题
在电场下，菱形三层石墨烯中超导性的量子蒙特卡洛研究
Quantum Monte Carlo study of superconductivity in rhombohedral trilayer graphene under an electric field
论文作者
论文摘要
通过使用约束相量子蒙特卡洛法，我们对三层蜂窝晶状体的一半填充哈伯德模型的基态进行了系统的研究。我们分析了垂直电场对电子结构，磁性和配对相关性的影响。发现抗铁磁性被垂直电场抑制，尤其是远程部分，而主要的磁波动仍然是抗铁磁磁性的。电子相关性驱动A $ D+ID $超导配对以优于各种电场和相互作用强度的其他配对模式。我们还发现，随着现场库仑相互作用的增加，$ D+ID $配对相关性大大增强。我们的密集数值结果可能揭示了在电场下菱形三层石墨烯中最近观察到的超导性的性质。
By using the constrained-phase quantum Monte Carlo method, we performed a systematic study of the ground state of the half filled Hubbard model for a trilayer honeycomb lattice. We analyze the effect of the perpendicular electric field on the electronic structure, magnetic property and pairing correlations. It is found that the antiferromagnetism is suppressed by the perpendicular electric field, especially the long-range parts, and the dominant magnetic fluctuations are still antiferromagnetic. The electronic correlation drives a $d+id$ superconducting pairing to be dominant over other pairing patterns among various electric fields and interaction strengths. We also found that the $d+id$ pairing correlation is greatly enhanced as the on-site Coulomb interaction is increased. Our intensive numerical results may unveil the nature of the recently observed superconductivity in rhombohedral trilayer graphene under an electric field.
