Luttinger-liquid behavior and superconducting correlations in {ital t}-{ital J} ladders
- Laboratoire de Physique Quantique, Universite Paul Sabatier, 31062 Toulouse (France)
The low-energy behavior of the isotropic {ital t}-{ital J} ladder system is investigated using exact diagonalization techniques, specifically finding the Drude weight, the charge velocity, and the compressibility. By applying the ideas of Luttinger-liquid theory, we determine the correlation exponent {ital K}{sub {rho}} which defines the behavior of the long-range correlations in the system. The boundary to phase separation is determined and a phase diagram is presented. At low electron density, a Tomonaga-Luttinger-like phase is stabilized while at higher electron densities a gapped phase with power law pairing correlations is stabilized: A large region of this gapped phase is found to exhibit dominant superconducting correlations. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 283883
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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