The paired-electron crystal in the two-dimensional frustrated quarter-filled band

H. Li, R. T. Clay, S. Mazumdar

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

The competition between antiferromagnetic and spin-singlet ground states within quantum spin models and the 1/2 -filled band Hubbard model has received intense scrutiny. Here we demonstrate a frustration-induced transition from Néel antiferromagnetism to a spin-singlet state in the interacting 1/4 -filled band on an anisotropic triangular lattice. While the antiferromagnetic state has equal charge densities, 0.5, on all sites, the spin-singlet state is a paired-electron crystal, with pairs of charge-rich sites separated by pairs of charge-poor sites. The paired-electron crystal provides a natural description of the spin-gapped state proximate to superconductivity in many organic charge transfer solids. Pressure-induced superconductivity in these correlated-electron systems is likely a result of a transition from the 1/4 -filled band valence bond solid to a valence bond liquid.

Original languageEnglish (US)
Article number272201
JournalJournal of Physics Condensed Matter
Volume22
Issue number27
DOIs
StatePublished - Jun 25 2010

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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