Enhanced superconductivity by near-neighbor attraction in the doped extended Hubbard model
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Clemson Univ., SC (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)
A recent experiment has unveiled an anomalously strong electron-electron attraction in the one-dimensional copper-oxide chain Ba2–xSrxCuO3+δ. While the effect of the near-neighbor electron attraction V in the one-dimensional extended Hubbard chain has been examined recently, its effect in the Hubbard model beyond the one-dimensional chain remains unclear. Here, in this work, we report a density matrix renormalization group study of the extended Hubbard model on long four-leg cylinders on the square lattice. We find that the near-neighbor electron attraction V can notably enhance the long-distance superconducting correlations while simultaneously suppressing the charge-density-wave (CDW) correlations. Specifically, for a modestly strong electron attraction, the superconducting correlations become dominant over the CDW correlations with a Luttinger exponent Ksc~1 and strong divergent superconducting susceptibility. Our results provide a promising way to realize long-range superconductivity in the doped Hubbard model. The relevance of our numerical results to cuprate materials is also discussed.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231
- OSTI ID:
- 2001436
- Journal Information:
- Physical Review. B, Vol. 107, Issue 20; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pair density wave in the doped three-band Hubbard model on two-leg square cylinders
Anomalously strong near-neighbor attraction in doped 1D cuprate chains
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
charge density waves
pairing mechanisms
superconducting order parameter
superconducting phase transition
cuprates
high-temperature superconductors
quantum many-body systems
strongly correlated systems
BCS theory
density matrix renormalization group
Hubbard model
Luttinger liquid model