Phase Transitions in the One-Dimensional Pair-Hopping Model: a Renormalization Group Study

Details Phase Transitions in the One-Dimensional Pair-Hopping Model: a Renormalization Group Study Phase Transitions in the One-Dimensional Pair-Hopping Model: a Renormalization Group Study

1995-05-02

arxiv.org/abs/cond-mat/9505006v1

Phys. Rev. B52 (1995) 10207-13

Physics

Condensed Matter

7 pages RevTeX, 6 uuencoded figures which can be (and by default are) directly included. Received by Phys. Rev. B 20 April 199

Scientific paper

10.1103/PhysRevB.52.10207

The phase diagram of a one-dimensional tight-binding model with a pair-hopping term (amplitude V) has been the subject of some controvery. Using two-loop renormalization group equations and the density matrix renormalization group with lengths L<=60, we argue that no spin-gap transition occurs at half-filling for positive V, contrary to recent claims. However, we point out that away from half-filling, a *phase-separation* transition occurs at finite V. This transition and the spin-gap transition occuring at half-filling and *negative* V are analyzed numerically.

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