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

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

Research output: Contribution to journalArticle

44 Citations (Scopus)

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 - 2010

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Superconductivity
Crystals
Electrons
crystals
Antiferromagnetism
Hubbard model
electrons
Electron transitions
Valence bands
Charge density
superconductivity
Ground state
Charge transfer
valence
antiferromagnetism
frustration
Liquids
charge transfer
ground state
liquids

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

The paired-electron crystal in the two-dimensional frustrated quarter-filled band. / Li, H.; Clay, R. T.; Mazumdar, Sumitendra.

In: Journal of Physics Condensed Matter, Vol. 22, No. 27, 272201, 2010.

Research output: Contribution to journalArticle

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