Systematic effective field theory investigation of spiral phases in hole-doped antiferromagnets on the honeycomb lattice

F. J. Jiang, F. Kämpfer, C. P. Hofmann, U. J. Wiese

研究成果: 雜誌貢獻文章

15 引文 斯高帕斯(Scopus)

摘要

Motivated by possible applications to the antiferromagnetic precursor of the high-temperature superconductor Na xCoO 2.yH 2O, we use a systematic low-energy effective field theory for magnons and holes to study different phases of doped antiferromagnets on the honeycomb lattice. The effective action contains a leading single-derivative term, similar to the Shraiman-Siggia term in the square lattice case, which gives rise to spirals in the staggered magnetization. Depending on the values of the low-energy parameters, either a homogeneous phase with four or a spiral phase with two filled hole pockets is energetically favored. Unlike in the square lattice case, at leading order the effective action has an accidental continuous spatial rotation symmetry. Consequently, the spiral may point in any direction and is not necessarily aligned with a lattice direction.

原文英語
頁(從 - 到)473-482
頁數10
期刊European Physical Journal B
69
發行號4
DOIs
出版狀態已發佈 - 2009 六月

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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