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 (3)

• Phase Diagram of the $t$--$U$--$V_1$--$V_2$ Model at Quarter Filling
• 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 (5)

• 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
• Superconductivity in a model of two Hubbard chains coupled with ferromagnetic exchange interaction
• 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