Dimerization-induced enhancement of the spin gap in the quarter-filled two-leg rectangular ladder

Y. Yan, S. Mazumdar, S. Ramasesha

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We report density-matrix renormalization group calculations of spin gaps in the quarter-filled correlated two-leg rectangular ladder with bond-dimerization along the legs of the ladder. In the small rung-coupling region, dimerization along the leg bonds can lead to large enhancement of the spin gap. Electron-electron interactions further enhance the spin gap, which is nonzero for all values of the rung electron hopping and for arbitrarily small bond-dimerization. Very large spin gaps, as are found experimentally in quarter-filled band organic charge-transfer solids with coupled pairs of quasi-one-dimensional stacks, however, occur within the model only for large dimerization and rung electron hopping that are nearly equal to the hopping along the legs. Coexistence of charge order and spin gap is also possible within the model for not too large intersite Coulomb interactions.

Original languageEnglish (US)
Article number224418
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number22
DOIs
StatePublished - Jun 20 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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