Superconductivity in the Two-Dimensional tJ Model

S. Sorella, G. B. Martins, F. Becca, C. Gazza, L. Capriotti, A. Parola, and E. Dagotto
Phys. Rev. Lett. 88, 117002 – Published 28 February 2002
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Abstract

Using computational techniques, it is shown that pairing is a robust property of hole-doped antiferromagnetic insulators. In one dimension and for two-leg ladder systems, a BCS-like variational wave function with long-bond spin singlets and a Jastrow factor provides an accurate representation of the ground state of the tJ model, even though strong quantum fluctuations destroy the off-diagonal superconducting long-range order in this case. However, in two dimensions it is argued—and numerically confirmed using several techniques, especially quantum Monte Carlo—that quantum fluctuations are not strong enough to suppress superconductivity.

  • Received 18 September 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.117002

©2002 American Physical Society

Authors & Affiliations

S. Sorella1, G. B. Martins2, F. Becca3, C. Gazza4, L. Capriotti5, A. Parola6, and E. Dagotto2

  • 1Istituto Nazionale per la Fisica della Materia, and SISSA, I-34014 Trieste, Italy
  • 2National High Magnetic Field Lab and Department of Physics, Florida State University, Tallahassee, Florida 32306
  • 3Institut de Physique Théorique, Université de Lausanne, CH-1015 Lausanne, Switzerland
  • 4Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, 2000 Rosario, Argentina
  • 5Istituto Nazionale per la Fisica della Materia, Unità di Ricerca di Firenze, I-50125 Firenze, Italy
  • 6Istituto Nazionale per la Fisica della Materia and Dipartimento di Scienze, Università dell'Insubria, I-22100 Como, Italy

Comments & Replies

Comment on “Superconductivity in the Two-Dimensional tJ Model”

T. K. Lee, C. T. Shih, Y. C. Chen, and H. Q. Lin
Phys. Rev. Lett. 89, 279702 (2002)

Sorella et al. Reply:

S. Sorella, A. Parola, F. Becca, L. Capriotti, C. Gazza, E. Dagotto, and G. Martins
Phys. Rev. Lett. 89, 279703 (2002)

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Vol. 88, Iss. 11 — 18 March 2002

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