Journal
PHYSICAL REVIEW B
Volume 88, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.041103
Keywords
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Funding
- NSF [OISE-0952300]
- EPSCoR [EPS-1003897]
- DOE SciDAC Grant [DE-FC02-10ER25916]
- Korean National Research Foundation [NRF-2011-0013866]
- NSF XSEDE Grant [DMR100007]
- Office Of The Director
- Office Of Internatl Science &Engineering [952300] Funding Source: National Science Foundation
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Using large-scale dynamical cluster quantum Monte Carlo simulations, we explore the unconventional superconductivity in the hole-doped Hubbard model on the triangular lattice. Due to the interplay of electronic correlations, geometric frustration, and Fermi surface topology, we find a doubly degenerate singlet pairing state at an interaction strength close to the bare bandwidth. Such an unconventional superconducting state is mediated by antiferromagnetic spin fluctuations along the Gamma-K direction, where the Fermi surface is nested. An exact decomposition of the irreducible particle-particle vertex further confirms the dominant component of the effective pairing interaction comes from the spin channel. Our findings suggest the existence of chiral d + id superconductivity in a hole-doped Hubbard triangular lattice in a strongly correlated regime, and provide insight into the superconducting phases of the water-intercalated sodium cobaltates NaxCoO2 center dot yH(2)O, as well as the organic compounds kappa-(ET)(2)X and Pd(dmit)(2).
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