论文标题
莫特绝缘状态和$ d+id $ $ $ $超导性
Mott insulating state and $d+id$ superconductivity in an ABC graphene trilayer
论文作者
论文摘要
由最近的实验性报道的ABC石墨烯三层超晶格中的可调节莫特绝缘状态和超导性的签名的动机，我们研究了在三层蜂蜜B lattice上，在哈伯德模型中，Hubbard模型中的电荷压缩性，自旋相关性和超导不稳定。发现在半填充时出现了抗磁性有序的莫特绝缘子，超出了关键的$ u_c $，而电子相关性驱动了$ d+id $超导配对，以优于广泛掺杂区域的其他配对模式。随着现场相互作用的增加，与$ d+id $配对对称性的有效配对相互作用大大增强，并且随着层间耦合强度的增加而被抑制。我们的密集数值结果表明，ABC石墨烯三层型中的绝缘状态和超导性是由强烈的电力相关性驱动的，并且它可能提供了一个有吸引力的系统来探索丰富的相关行为。
Motivated by the recently experimental reported signatures of the tunable Mott insulating state and superconductivity in an ABC graphene trilayer superlattice, we investigate the charge compressibility, the spin correlation, and the superconducting instability within the Hubbard model on a three-layer honeycomb lattice. It is found that an antiferromagnetically ordered Mott insulator emerges beyond a critical $U_c$ at half-filling, and the electronic correlation drives a $d+id$ superconducting pairing to be dominant over other pairing patterns in a wide doped region. The effective pairing interaction with $d+id$ pairing symmetry is strongly enhanced with the increasing of on-site interaction, and suppressed as the interlayer coupling strength increases. Our intensive numerical results demonstrate that the insulating state and superconductivity in an ABC graphene trilayer are driven by strong electric correlation, and it may offer an attractive systems to explore rich correlated behaviors.
