The 1D t-J model with next-nearest neighbor hopping - breakdown of the Luttinger liquid?

Details The 1D t-J model with next-nearest neighbor hopping - breakdown of the Luttinger liquid? The 1D t-J model with next-nearest neighbor hopping - breakdown of the Luttinger liquid?

1997-06-12

arxiv.org/abs/cond-mat/9706126v1

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 4 pages with 5 included eps-figures. Hardcopies of figures (or the entire manuscript) may also be obtained by e-mail r

Scientific paper

10.1103/PhysRevB.56.R14247

We investigate the effect of a next-nearest neighbor hopping integral t' in the 1D t-J model, using Lanczos diagonalization of finite chains. Surprisingly, even moderate values of t' have a quite dramatic effect on the dynamical correlation functions and Fermi surface volume. The `holon' becomes diffuse and overdamped, the band structure near the Fermi energy is dominated by t'. Most importantly, however, with increasing hole concentration the system undergoes a phase transition from a `hole pocket' Fermi surface, where k_F corresponds to the number of holes rather than electrons, to a high doping phase where the doped holes correspond to spinless Fermions. Neither phase thus has a Fermi momentum compatible with the `standard' Luttinger liquid.

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