Superconducting pairing symmetries of the Hubbard model on the honeycomb lattice with inhomogeneous hopping strength

Ying, Tao; Yang, Shuhui

doi:10.1103/physrevb.102.125125

Cited by 7 publications

(2 citation statements)

References 51 publications

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“…Though U = 8 is argued to be optimal for the superconducting pairing on the Hubbard square lattice, the severe sign problem at strong interaction strength is a big obstacle. On the other hand, the qualitative evolution of the superconducting pairing is not sensitive to the interaction strength, as being proven previously in the Hubbard model on different lattice geometries [49][50][51], and can also be seen in this study. The electron density is chosen to be ρ = 0.875, corresponding to the hole doping δ = 1/8 which is argued to be optimal for the superconductivity [52], another density ρ = 0.917 is also studied for comparison.…”

Section: Model and Methodologysupporting

confidence: 85%

Enhanced d-wave pairing in the two-dimensional Hubbard model with periodically modulated hopping amplitudes

Yang

Liu

et al. 2022

J. Phys.: Condens. Matter

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Utilizing determinant quantum Monte Carlo algorithm, the evolution of the d-wave pairing in the Hubbard model on the square lattice tuned by the periodically modulated hopping amplitudes is studied. The hopping amplitudes are homogeneous in the x ˆ -direction, while in the y ˆ -direction the hopping amplitudes are modulated with period P, where t y = t + d t , t y ′ = t − ( P − 1 ) d t , and the modulation period P equals 2, 3 and 4 lattice spacings. The latter two modulation periods are motivated by the observation of period-3 and period-4 stripe order in cuprate superconductors. For all the periods P, we find that the modulated hopping inhomogeneity enhances the d-wave pairing and an optimal inhomogeneity exists.

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Section: Model and Methodologysupporting

confidence: 85%

Enhanced d-wave pairing in the two-dimensional Hubbard model with periodically modulated hopping amplitudes

Yang

Liu

et al. 2022

J. Phys.: Condens. Matter

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“…Qualitatively, the results for U = 2 agree well with those for U = 4, as can be compared with figures and 5. This suggests that, similar to the half-filled homogeneous Hubbard model [20,[60][61][62], the physics of doping Hubbard model with NNN hopping is not highly sensitive to the interaction strength U, though the ground state may no longer be an AFM insulator, but with the competition of the FM order. In this way, one may also expect our conclusion is applicable to the strong U limit.…”

Section: Resultsmentioning

confidence: 95%

Quantum Monte Carlo study of the Hubbard model with next-nearest-neighbor hopping t′: pairing and magnetism

Yang

Ying

et al. 2020

J. Phys.: Condens. Matter

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Using the finite-temperature determinant quantum Monte Carlo (DQMC) algorithm, we study the pairing symmetries of the Hubbard Hamiltonian with next-nearest-neighbor (NNN) hopping t′ on square lattices. By varying the value of t′, we find that the d-wave pairing is suppressed by the onset of t′, while the p + ip-wave pairing tends to emerge for low electron density and t′ around −0.7. Together with the calculation of the anti-ferromagnetic and ferromagnetic spin correlation function, we explore the relationship between anti-ferromagnetic order and the d-wave pairing symmetry, and the relationship between ferromagnetic order and the p + ip-wave pairing symmetry. Our results may be useful for the exploration of the mechanism of the electron pairing symmetries, and for the realization of the exotic p + ip-wave superconductivity.

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Mixed pairing states of honeycomb model

Alsharari

2022

Physica C: Superconductivity and its Applications

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Superconducting pairing symmetries of the Hubbard model on the honeycomb lattice with inhomogeneous hopping strength

Cited by 7 publications

References 51 publications

Enhanced d-wave pairing in the two-dimensional Hubbard model with periodically modulated hopping amplitudes

Enhanced d-wave pairing in the two-dimensional Hubbard model with periodically modulated hopping amplitudes

Quantum Monte Carlo study of the Hubbard model with next-nearest-neighbor hopping t′: pairing and magnetism

Mixed pairing states of honeycomb model

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