Ring Exchange Mechanism for Triplet Superconductivity in a Two-Chain Hubbard Model: Possible Relevance to Bechgaard Salts

Abstract

The density-matrix renormalization group method is used to study the ground state of the two-chain zigzag-bond Hubbard model at quarter filling. We show that, with a proper choice of the signs of hopping integrals, the ring exchange mechanism yields ferromagnetic spin correlations between interchain neighboring sites, and produces the attractive interaction between electrons as well as the long-range pair correlations in the spin-triplet channel, thereby leading the system to triplet superconductivity. We argue that this novel mechanism may have possible relevance to observed superconductivity in Bechgaard salts.

References in corpus (13)

• Ferromagnetism in Hubbard Models
• Ferromagnetic transition and phase diagram of the one-dimensional Hubbard model with next-nearest-neighbor hopping
• Spin-triplet `f-wave' pairing proposed for an organic superconductor (TMTSF)_2 PF_6
• Possible Triplet Electron Pairing and an Anisotropic Spin Susceptibility in Organic Superconductors (TMTSF)_2 X
• Magnetic Determination of $H_{c2}$ under Accurate Alignment in (TMTSF)${}_2$ClO${}_4$
• Ferromagnetism in multi--band Hubbard models: From weak to strong Coulomb repulsion
• Microscopic theory of spin-triplet $f$-wave pairing in quasi-1D organic superconductors
• Superconductivity and Density Wave in the Quasi-One-Dimensional Systems: Renormalization Group Study
• Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model
• Phase Diagram of the $t$--$U$--$V_1$--$V_2$ Model at Quarter Filling
• Anomalous behaviors of the charge and spin degrees of freedom in the CuO double chains of PrBa${}_2$Cu${}_4$O${}_8$
• Optical conductivity of the one-dimensional dimerized Hubbard model at quarter filling
• Spin-Triplet Superconductivity Mediated by Phonons in Quasi-One-Dimensional Systems

Cited by in corpus (10)

• Pairing Symmetry Competition in Organic Superconductors
• Superconductivity in the CuO double chain of Pr_2Ba_4Cu_7O_15-delta on the basis of Tomonaga-Luttinger liquid theory
• Phase diagram of the one-dimensional Hubbard model with next-nearest-neighbor hopping
• Triplet superconductivity in a 1D itinerant electron system with transverse spin anisotropy
• On the Origin of the Anomalous Upper Critical Field in Quasi-One-Dimensional Superconductors
• Superconductivity in a model of two Hubbard chains coupled with ferromagnetic exchange interaction
• Triplet superconductivity in coupled odd-gon rings
• Microscopic theory of a superconducting gap in the quasi-one-dimensional organic conductor (TMTSF)${}_2$ClO${}_4$: Model derivation and two-particle self-consistent analysis
• Charge and spin excitation spectra in the one-dimensional Hubbard model with next-nearest-neighbor hopping
• Mixing of odd- and even-frequency pairings in strongly correlated electron systems under magnetic field