Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts

Abstract

We introduce and analyze a variational wave function for quasi two-dimensional kappa-ET organic salts containing strong local and nonlocal correlation effects. We find an unconventional superconducting ground state for intermediate charge carrier interaction, sandwiched between a conventional metal at weak coupling and a spin liquid at larger coupling. Most remarkably, the excitation spectrum is dramatically renormalized and is found to be the driving force for the formation of the unusual superconducting state.

arXiv comment4 pages, 4 figures

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• Strong electronic correlations in superconducting organic charge transfer salts
• Variational Monte Carlo Method Combined with Quantum-Number Projection and Multi-Variable Optimization
• Electronic Structure Calculation by First Principles for Strongly Correlated Electron Systems
• Weak Mott insulators on the triangular lattice: possibility of a gapless nematic quantum spin liquid
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• Exact diagonalization study of Mott transition in the Hubbard model on an anisotropic triangular lattice
• Spin-liquid versus spiral-order phases in the anisotropic triangular lattice
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• Pairing Symmetry Competition in Organic Superconductors
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• Self-consistent slave rotor mean field theory for strongly correlated systems
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• Symmetry of the superconducting order parameter in frustrated systems determined by the spatial anisotropy of spin correlations
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• Emergence of superconductivity, valence bond order and Mott insulators in Pd[(dmit)2] based organic salts
• Evaluation techniques for Gutzwiller wave functions in finite dimensions
• Variational Monte-Carlo studies of Gossamer Superconductivity
• Interaction induced Fermi-surface renormalization in the $t_1-t_2$ Hubbard model close to the Mott-Hubbard transition
• Entanglement in doped Resonating Valence Bond states
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