Ground-state phase diagram of the one-dimensional dimerized t-J model at quarter filling

Abstract

The ground state of the one-dimensional dimerized $t$$-$$J$ model at quarter filling is studied by a Lanczos exact-diagonalization technique on small clusters. We calculate the charge gap, spin gap, binding energy, Tomonaga-Luttinger-liquid parameter, Drude weight, anomalous flux quantization, etc. We thereby show that the two types of dimerization, i.e., a dimerization of hopping integral and a dimerization of exchange interaction play a mutually competing role in controlling the ground state of the system and this leads to the emergence of various phases including the Mott insulating, Tomonaga-Luttinger-liquid, and Luther-Emery-liquid phases. The ground-state phase diagram of the model is given on the parameter space of the dimerizations.

7 pages with 9 figures. Figures will be sent by mail upon request

References in corpus (6)

• Antiferromagnetic Phases of One-Dimensional Quarter-Filled Organic Conductors
• NaV_2O_5 as a quarter-filled ladder compound
• A new view of the electronic structure of the spin-Peierls compound alpha'-NaV2O5
• Renormalization group analysis of the spin-gap phase in the one-dimensional t-J model
• Spin-Gap Phase in the One-Dimensional t-J-J' Model
• Critical Dimerization Strength of the Quarter-Filled t-J Model

Cited by in corpus (4)

• Tomonaga-Luttinger parameters and spin excitations in the dimerized extended Hubbard model
• Emergence of Irrationality: Magnetization Plateaux in Modulated Hubbard Chains
• Studies of the t-J two-leg ladder via series expansions
• Strongly enhanced superconductivity in coupled t-J segments