Fang Shi-Chao, Zheng Xiao-Jun, Lin Hai-Qing, Huang Zhong-Bing
Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, People's Republic of China.
Beijing Computational Science Research Center, Beijing 100193, People's Republic of China.
J Phys Condens Matter. 2021 Jan 13;33(2):025601. doi: 10.1088/1361-648X/abb685.
Using the constrained-path quantum Monte Carlo method, we systematically study the half-filled Hubbard model on AA-stacked honeycomb lattice. Our simulations demonstrate that a dominant chiral d + id wave superconductivity can be induced by a perpendicular electric field. At a fixed electric field, the effective pairing interaction of chiral d + id superconductivity exhibits an increasing behavior with increasing the on-site Coulomb interaction. We attribute the electric field-induced d + id superconductivity to an increased density of states near the Fermi energy and robust antiferromagnetic spin correlation upon turning on electric field. Our results strongly suggest that the AA-stacked graphene system is a good candidate for chiral d + id superconductor.
利用约束路径量子蒙特卡罗方法，我们系统地研究了AA堆叠蜂窝晶格上的半填充哈伯德模型。我们的模拟表明，垂直电场可以诱导出主导的手性d + id波超导性。在固定电场下，手性d + id超导的有效配对相互作用随着在位库仑相互作用的增加而呈现出增加的行为。我们将电场诱导的d + id超导归因于费米能量附近态密度的增加以及开启电场时稳健的反铁磁自旋关联。我们的结果有力地表明，AA堆叠的石墨烯系统是手性d + id超导体的良好候选者。
