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Title: Spin and charge modes of the {ital t}-{ital J} ladder

Abstract

The spin and charge excitations of the {ital t}-{ital J} ladder are studied by exact diagonalization techniques for several electron densities. The various modes are classified according to their spin (singlet or triplet excitations) and their parity under a reflection with respect to the symmetry axis along the chains and a finite-size scaling of the related gaps is performed. At low doping, formation of hole pairs leads to a spin gap for all {ital J}/{ital t} ratios. This phase is characterized by (at least) one vanishing energy mode {ital only} in the charge bonding channel when {ital K}{sub {ital x}}{r_arrow}0 consistent with the existence of superconducting pairing correlations. At larger doping the spin gap disappears. Although the antibonding modes remain gapped, low-energy {ital K}{sub {ital x}}{similar_to}0 and {ital K}{sub {ital x}}{similar_to}2{ital k}{sub {ital F}} spin and charge bonding modes are found consistent with a single-band Luttinger scenario. At sufficient low electron density and above a critical value of {ital J}/{ital t} we also expect another phase of electron pairs with gapped spin excitations.

Authors:
 [1];  [2];  [3]
  1. Laboratoire de Physique Quantique, Universite Paul Sabatier, 31062 Toulouse (France)
  2. Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106 (United States)
  3. Institute for Physics, University of Wuerzburg, D-8700 Wuerzburg (Germany)
Publication Date:
OSTI Identifier:
115833
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 52; Journal Issue: 9; Other Information: PBD: 1 Sep 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HIGH-TC SUPERCONDUCTORS; ELECTRON CORRELATION; SUBSTOICHIOMETRY; CUPRATES; SCALING LAWS; ELECTRON DENSITY; ELECTRON PAIRS; ENERGY-LEVEL DENSITY

Citation Formats

Poilblanc, D, Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106, Scalapino, D J, Hanke, W, and Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106. Spin and charge modes of the {ital t}-{ital J} ladder. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.52.6796.
Poilblanc, D, Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106, Scalapino, D J, Hanke, W, & Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106. Spin and charge modes of the {ital t}-{ital J} ladder. United States. https://doi.org/10.1103/PhysRevB.52.6796
Poilblanc, D, Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106, Scalapino, D J, Hanke, W, and Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106. Fri . "Spin and charge modes of the {ital t}-{ital J} ladder". United States. https://doi.org/10.1103/PhysRevB.52.6796.
@article{osti_115833,
title = {Spin and charge modes of the {ital t}-{ital J} ladder},
author = {Poilblanc, D and Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106 and Scalapino, D J and Hanke, W and Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106},
abstractNote = {The spin and charge excitations of the {ital t}-{ital J} ladder are studied by exact diagonalization techniques for several electron densities. The various modes are classified according to their spin (singlet or triplet excitations) and their parity under a reflection with respect to the symmetry axis along the chains and a finite-size scaling of the related gaps is performed. At low doping, formation of hole pairs leads to a spin gap for all {ital J}/{ital t} ratios. This phase is characterized by (at least) one vanishing energy mode {ital only} in the charge bonding channel when {ital K}{sub {ital x}}{r_arrow}0 consistent with the existence of superconducting pairing correlations. At larger doping the spin gap disappears. Although the antibonding modes remain gapped, low-energy {ital K}{sub {ital x}}{similar_to}0 and {ital K}{sub {ital x}}{similar_to}2{ital k}{sub {ital F}} spin and charge bonding modes are found consistent with a single-band Luttinger scenario. At sufficient low electron density and above a critical value of {ital J}/{ital t} we also expect another phase of electron pairs with gapped spin excitations.},
doi = {10.1103/PhysRevB.52.6796},
url = {https://www.osti.gov/biblio/115833}, journal = {Physical Review, B: Condensed Matter},
number = 9,
volume = 52,
place = {United States},
year = {1995},
month = {9}
}