Quantum Monte Carlo Study of the Quasi-One-Dimensional Superconductivity

Abstract

We report on the result of quantum Monte Carlo simulation of quasi-one-dimensional electron systems at 1/4-filling, considering organic superconductors such as TMTSF- and TMTTF-salts. We focus on the effect of dimensionality (interchain coupling) on superconducting fluctuation. First we consider Hubbard model which includes only on-site repulsion U. We find that the increase of interchain coupling enhances superconducting susceptibility, although it deforms the nested Fermi surface and suppresses the spin susceptibility. Next we consider an extended Hubbard model which includes nearest-neighbor repulsion V . In this case we consider the competition between different symmetries of electron pairing, d_{x^2-y^2} - and d_xy-wave symmetry, and find that the particle-particle interaction vertex for d_{x^2-y^2}-wave pairing is no longer attractive even in the region where nesting condition still holds. On the other hand, the interaction vertex for d_xy-wave pairing persists to be attractive. The obtained results for the Hubbard model show qualitative agreement with recent renormalization group study, and have the possibility of accounting for the recent experimental result of (TMTTF)2SbF6, which exhibits a wider superconducting phase than the previous studies.

8 pages, 14 figures

References in corpus (14)

• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Microscopic theory of spin-triplet $f$-wave pairing in quasi-1D organic superconductors
• Interplay between spin-density-wave and superconducting states in quasi-one-dimensional conductors
• Superconductivity and Density Wave in the Quasi-One-Dimensional Systems: Renormalization Group Study
• Crossover from Quarter-Filling to Half-Filling in a One-Dimensional Electron System with a Dimerized and Quarter-Filled Band
• Charge fluctuation induced superconducting state in two-dimensional quarter-filled electron systems
• Effects of Next-Nearest-Neighbor Repulsion on One-Dimensional Quarter-Filled Electron Systems
• Effects of Spin Fluctuations in Quasi-One-Dimensional Organic Superconductors
• Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model
• Dimensional Crossovers in the Doped Ladder System: Spin Gap, Superconductivity and Interladder Coherent Band Motion
• Role of Interchain Hopping in the Magnetic Susceptibility of Quasi-One-Dimensional Electron Systems
• Superconductivity in the vicinity of charge ordered state in organic conductor beta-(meso-DMBEDT-TTF)_2PF_6
• Development of superconducting correlation at low temperatures in the two-dimensional t-J model
• Increase of Superconducting Correlation due to Dimensionality Change in Quasi-One-Dimensional Conductors

Cited by in corpus (4)

• Fulde-Ferrell-Larkin-Ovchinnikov phase in the presence of pair hopping interaction
• Superconducting pairing symmetry on the extended Hubbard model in the presence of the Rashba-type spin-orbit coupling
• Superconductivity without attraction in a quasi-one-dimensional metal
• Competition between different order parameters in a quasi-one-dimensional superconductor