The coexistence of superconductivity and charge inhomogeneity was observed in many cuprate superconductors.The relationship between those two is still controversial.Similarly,in the graphene sheets of the intercalated...The coexistence of superconductivity and charge inhomogeneity was observed in many cuprate superconductors.The relationship between those two is still controversial.Similarly,in the graphene sheets of the intercalated graphitic superconductor CaC_(6),the charge inhomogeneity was also observed.We simulate such a system by constructing the Hubbard model on the honeycomb lattice with charge inhomogeneity imposed by force.Utilizing the finite-temperature determinant quantum Monte Carlo algorithm,we examine the relationship between the superconducting pairing and the charge inhomogeneity.An optimal charge inhomogeneity for the d+id-wave pairing is found.While for other artificial charge inhomogeneities,the d+id-wave pairing is monotonically suppressed.The possibleπ-phase shift induced by charge inhomogeneity is also examined.展开更多
基金sponsored by the Natural Science Foundation of Chongqing,China(Grant No.cstc2021jcyj-msxmX1009)the Joint Guiding Project of Natural Science Foundation of Heilongjiang Province(Grant No.LH2019A011).
文摘The coexistence of superconductivity and charge inhomogeneity was observed in many cuprate superconductors.The relationship between those two is still controversial.Similarly,in the graphene sheets of the intercalated graphitic superconductor CaC_(6),the charge inhomogeneity was also observed.We simulate such a system by constructing the Hubbard model on the honeycomb lattice with charge inhomogeneity imposed by force.Utilizing the finite-temperature determinant quantum Monte Carlo algorithm,we examine the relationship between the superconducting pairing and the charge inhomogeneity.An optimal charge inhomogeneity for the d+id-wave pairing is found.While for other artificial charge inhomogeneities,the d+id-wave pairing is monotonically suppressed.The possibleπ-phase shift induced by charge inhomogeneity is also examined.
