Comparison of different ladder models

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.58.9492· OSTI ID:298596

Jeckelmann, E ^[1]; Scalapino, D J ^[2]; White, S R ^[3]

---

1. Department of Physics, University of California, Irvine, California, 92697 (United States)
2. Department of Physics, University of California, Santa Barbara, California, 93106 (United States)
3. Department of Physics, University of California, Irvine, California 92697 (United States)

Using density matrix renormalization group calculations, we compare results obtained for the t-J, one-band Hubbard, and three-band Hubbard models of a two-leg CuO ladder. Spin and charge gaps, pair binding energies, and effective pair hoppings are calculated for a wide range of parameters. All three models have an insulating state at a filling corresponding to one hole per Cu site. For physically relevant parameters their spin gaps are similar in size but they exhibit quite different charge gaps. We find that the binding energy of a pair of doped holes is of the order of the undoped ladder spin gap for all three models. The main difference between the models is the size of the effective pair hopping, which is significantly larger in the three-band model with parameters appropriate for CuO materials than in the other two models. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 298596
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 58; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINDING ENERGY
COPPER COMPOUNDS
COPPER OXIDES
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
LADDER APPROXIMATION