The t-Jz ladder

Details The t-Jz ladder The t-Jz ladder

2005-11-22

arxiv.org/abs/cond-mat/0511528v1

Phys. Rev. B 73, 144508 (2006)

Physics

Condensed Matter

Statistical Mechanics

18 figures

Scientific paper

10.1103/PhysRevB.73.144508

The phase diagram of the two-leg t-Jz ladder is explored, using the density matrix renormalization group method. Results are obtained for energy gaps, electron density profiles and correlation functions for the half-filled and quarter-filled cases. The effective Lagrangian velocity parameter is shown to vanish at half-filling. The behaviour of the one-hole gap in the Nagaoka limit is investigated, and found to disagree with theoretical predictions. A tentative phase diagram is presented, which is quite similar to the full t-J ladder, but scaled up by a factor of about two in coupling. Near half-filling a Luther-Emery phase is found, which may be expected to show superconducting correlations, while near quarter-filling the system appears to be in a Tomonaga-Luttinger phase.

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