New phase in the one-dimensionalt-Jmodel

Y. C. Chen, T. K. Lee
1993 Physical Review B (Condensed Matter)  
A new phase of a gas of pairs of electrons bounded in a singlet state is found in the one-dimensional t -J model for J )2t and the density of electrons less than 0.2. This phase was conjectured in the study of the diagonalization of small lattices [Phys. Rev. Lett. 66, 2388 (1991)]. The existence of this new phase for much larger lattice sizes is demonstrated by a combination of two numerical methods, the variational Monte Carlo and the power method. A trial wave function for this phase is
more » ... sed and shown to be in good agreement with the ground state obtained by the power method.
doi:10.1103/physrevb.47.11548 pmid:10005307 fatcat:2gwbqabjmvcnznwxd5sckls76m