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.

Corrected typos

References in corpus (4)

• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Coexistence of Charge Order and Spin-Peierls Lattice Distortion in One-Dimensional Organic Conductors
• Temperature-driven transition from the Wigner Crystal to the Bond-Charge-Density Wave in the Quasi-One-Dimensional Quarter-Filled band
• Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures

Cited by in corpus (6)

• Spiral charge frustration in molecular conductor (DI-DCNQI)2Ag
• Phase competitions and coexistences in quasi-one-dimensional molecular conductors: exact diagonalization study
• Magnetic Field Effect in One-Dimensional Charge Ordering Systems
• Bond patterns and charge order amplitude in 1/4-filled charge-transfer solids
• Kekulé valence bond order in the Hubbard model on the honeycomb lattice with possible lattice distortions for graphene
• Stability of correlated insulating states in molecular conductors from first-principles calculation