Electric field-induced chiral d+id superconductivity in AA-stacked bilayer graphene: a quantum Monte Carlo study. (15th October 2020)

• Record Type: Journal Article
• Authors: Fang, Shi-Chao; Zheng, Xiao-Jun; Lin, Hai-Qing; Huang, Zhong-Bing
• Is Part Of: Journal of physics. Volume 33:Number 2(2021)
• Publication Date: 2020-10-15
• Subjects: chiral d + id superconductor -- bilayer graphene -- electric field -- pairing symmetry; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/abb685
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: 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.