Ising transition in a one-dimensional quarter-filled electron system with dimerization

Masahisa Tsuchiizu (1) , Edmond Orignac (2)

1 Condensed Matter Theory Group, Physics Department
2 LPTENS - Laboratoire de Physique Théorique de l'ENS [École Normale Supérieure]

We examine critical properties of the quarter-filled one-dimensional Hubbard model with dimerization and with the onsite and nearest-neighbor Coulomb repulsion U and V. By utilizing the bosonization method, it is shown that the system exhibits an Ising quantum phase transition from the Mott insulating state to the charge-ordered insulating state. It is also shown that the dielectric permittivity exhibits a strong enhancement as decreasing temperature with power-law dependence at the Ising critical point.

Domaines: Autre [cond-mat.other]

Masahisa Tsuchiizu, Edmond Orignac. Ising transition in a one-dimensional quarter-filled electron system with dimerization. Correlated Electrons, 2001, Kashiwa, Chiba Prefecture, Japan. pp.1459, ⟨10.1016/S0022-3697(02)00003-3⟩. ⟨hal-00007692⟩