Insulating phases of the one-dimensional t-J model with nearest-neighbor repulsive interaction
Department of Applied Physics, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
2 School of Physics, Xinjiang University, Urumqi, 830046, P.R. China
Corresponding author: a email@example.com
Published online: 14 January 2011
Using the deformed Hubbard operator approach, we analytically study weak-coupling phase diagram of the one-dimensional t-J-V model at half filling. In the case of small deformed parameter ζ(≪1), the interactions induced by the no double occupancy constraint are softened, accessible by the bosonization field theory and the renormalization group technique. The ground state exhibits insulating behavior of density-wave correlations. The bond-spin-density-wave (BSDW) and bond-charge-density-wave (BCDW) phases are realized in the whole weak-coupling regime while the charge-density-wave (CDW) and spin-density-wave (SDW) phases depend on V/J > (V/J)c or V/J < (V/J)c, where (V/J)c = 1/4. Furthermore, our results are expected to adiabatically continue back to ζ = 1.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011