Superconductivity Driven by Chain Coupling and Electronic Correlations

Abstract

We present an analysis of a system of weakly coupled Hubbard chains based on combining an exact study of spectral functions of the uncoupled chain system with a renormalization group method for the coupled chains. For low values of the onsite repulsion $U$ and of the doping $\delta$, the leading instability is towards a superconducting state. The process includes excited states above a small correlation pseudogap. Similar features appear in extended Hubbard models in the vicinity of commensurate fillings. Our theoretical predictions are consistent with the phase diagram observed in the (TMTTF)${}_2$X and (TMTSF)${}_2$X series of organic compounds.

arXiv comment7 pages, 2 figures

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Cited by in corpus (4)

• Finite-Energy Spectral-Weight Distributions of a 1D Correlated Metal
• Dynamical Functions of a 1D Correlated Quantum Liquid
• Spectral microscopic mechanisms and quantum phase transitions in a 1D correlated problem
• Scattering mechanisms and spectral properties of the one-dimensional Hubbard model