Spin-wave spectra of a Kagome stripe

A. Donkov, A. V. Chubukov

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2 Scopus citations

Abstract

We study ground-state degeneracy and spin-wave excitations in a 1D version of a Kagome antiferromagnet - a Heisenberg antiferromagnet on a Kagome stripe. We show that for nearest-neighbor interaction, the classical ground state is infinitely degenerate. For any spin configuration from the degenerate set, the classical spin-wave spectrum contains, in addition to Goldstone modes, a branch of zero-energy excitations, and a zero mode in another branch. We demonstrate that the interactions beyond nearest neighbors lift the degeneracy, eliminate a zero mode, and give a finite dispersion to formerly zero-energy branch, leaving only Goldstone modes as zero-energy excitations.

Original languageEnglish (US)
Article number67005
JournalEPL
Volume80
Issue number6
DOIs
StatePublished - Dec 1 2007

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