Journal
PHYSICAL REVIEW B
Volume 84, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.121410
Keywords
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Funding
- HKSAR RGC [CUHK 402310]
- NSFC [10974047]
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To address the issue of electron correlation driven superconductivity in graphene, we perform a systematic quantum Monte Carlo study of the pairing correlation in the t-U-V Hubbard model on a honeycomb lattice. For V = 0 and close to half filling, we find that pairing with d + id (d(x2-y2) + id'(xy) in its specific form) symmetry dominates pairing with extended-s symmetry. However, as the system size or the on-site Coulomb interaction increases, the long-range part of the d + id pairing correlation decreases and tends to vanish in the thermodynamic limit. An inclusion of nearest-neighbor interaction V, either repulsive or attractive, has a small effect on the extended-s pairing correlation, but strongly suppresses the d + id pairing correlation.
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