Coulomb correlations, broken symmetries and dimensionality effects

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Abstract

Within single particle theories occurrence of spatial broken symmetries depend only on nesting. This picture is shown to change dramatically for nonzero Coulomb interactions, where dimensionality plays a much stronger role. We examine the Peierls-Hubbard model in two dimension, and show that while the simple Peierls instability can occur in one, two or three dimension for perfect nesting, the Hubbard interaction destroys this instability for dimensionality greater than one. The spin-Peierls transition is a unique feature of one dimension. The above is also related to the occurrence of antiferromagnetism in two dimension. Recent observation of the vanishing of the spin-Peierls phase and the appearance of an antiferromagnetic phase in TMTTF-salts under pressure can be explained within the present theory.

Original languageEnglish (US)
JournalSynthetic Metals
Volume27
Issue number1-2
DOIs
StatePublished - Dec 15 1988
Externally publishedYes

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broken symmetry
Antiferromagnetism
Hubbard model
Coulomb interactions
Salts
occurrences
particle theory
antiferromagnetism
interactions
salts

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Coulomb correlations, broken symmetries and dimensionality effects. / Mazumdar, Sumitendra.

In: Synthetic Metals, Vol. 27, No. 1-2, 15.12.1988.

Research output: Contribution to journalArticle

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