Finite-Temperature Phase Diagram of Quasi-One-Dimensional Molecular Conductors: Quantum Monte Carlo Study

Abstract

Finite-temperature phase transitions in quasi-one-dimensional quarter-filled systems are investigated by the extended Hubbard model with electron-lattice coupling. Using a quantum Monte Carlo method combined with the inter-chain mean-field approximation, we clarify competing and coexisting behaviors among charge ordering, dimer Mott, and spin-Peierls states. It is pointed out that an anharmonicity of lattice distortions plays an important role in multi-critical behaviors. The results are compared with experimental data for quasi-one-dimensional molecular conductors such as DCNQI and TMTTF compounds.

arXiv commentCorrected typos

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Cited by in corpus (17)

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• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Purely electronic THz polarization in dimer Mott insulators
• Tuning the magnetic dimensionality by charge ordering in the molecular TMTTF salts
• Enhancement of Spin Susceptibility near Charge-Ordering Transition in a Two-Dimensional Extended Hubbard Model
• Magnetism and Charge ordering in TMTTF${}_2$-PF${}_6$ organic crystals
• Phonon-Spectrum Narrowing Induced by Ultrafast Charge Fluctuation in an Organic Dimer Mott Insulator
• Spiral charge frustration in molecular conductor (DI-DCNQI)2Ag
• Spin frustration, charge ordering, and enhanced antiferromagnetism in TMTTF${}_2$SbF${}_6$
• Bond patterns and charge order amplitude in 1/4-filled charge-transfer solids
• Phase competitions and coexistences in quasi-one-dimensional molecular conductors: exact diagonalization study
• Magnetic Field Effect in One-Dimensional Charge Ordering Systems
• Kekulé valence bond order in the Hubbard model on the honeycomb lattice with possible lattice distortions for graphene
• Ground state and finite temperature behavior of 1/4-filled band zigzag ladders
• Anharmonicity in one-dimensional electron-phonon system
• Finite-Temperature Properties across the Charge Ordering Transition -- Combined Bosonization, Renormalization Group, and Numerical Methods
• Stability of correlated insulating states in molecular conductors from first-principles calculation