Hitoshi Seo

Quantum melting of charge order due to frustration in two-dimensional quarter-filled systems

The effect of geometrical frustration in a two-dimensional

Coexistence of Charge Order and Spin–Peierls Lattice Distortion in One-Dimensional Organic Conductors

1∕4

Aspects of the Verwey transition in magnetite

-filled strongly correlated electron system is studied theoretically, motivated by layered organic molecular crystals. An extended Hubbard model on the square lattice is considered, with competing nearest-neighbor Coulomb interaction

Theory of the Verwey transition in Fe3O4

V

Orbital ordering and bond dimerization in magnetite Fe3O4

, and that of next-nearest neighbor along one of the diagonals

Reentrant behavior and gigantic response in a disordered spin-Peierls system

{V}^{ensuremath{}}

Toward systematic understanding of diversity of electronic properties in low-dimensional molecular solids.

, which favor different charge ordered states. Based on exact diagonalization calculations, we find a metallic phase stabilized over a broad window at

Co-existence of charge order and spin Peierls lattice distortion in one-dimensional organic compounds

{V}^{ensuremath{}}ensuremath{sim}V

Antiferromagnetism and gigantic response in disordered spin-Peierls system

even for large Coulomb repulsion strengths as a result of frustrating the charge ordered states. Slightly modifying the lattice geometry relevant to the actual organic compounds does not alter the results, suggesting that this ``quantum melting of charge order is a robust feature of frustrated strongly correlated

Quantum effects on charge order

1∕4