Striped spin liquid crystal ground state instability of kagome antiferromagnets

Bryan K. Clark, Jesse M. Kinder, Eric Neuscamman, Garnet Kin Lic Chan, Michael J. Lawler

Research output: Contribution to journalArticle

Abstract

The Dirac spin liquid ground state of the spin 1/2 Heisenberg kagome antiferromagnet has potential instabilities. This has been suggested as the reason why it does not emerge as the ground state in large-scale numerical calculations. However, previous attempts to observe these instabilities have failed. We report on the discovery of a projected BCS state with lower energy than the projected Dirac spin liquid state which provides new insight into the stability of the ground state of the kagome antiferromagnet. The new state has three remarkable features. First, it breaks spatial symmetry in an unusual way that may leave spinons deconfined along one direction. Second, it breaks the U(1) gauge symmetry down to Z2. Third, it has the spatial symmetry of a previously proposed "monopole" suggesting that it is an instability of the Dirac spin liquid. The state described herein also shares a remarkable similarity to the distortion of the kagome lattice observed at low Zn concentrations in Zn-paratacamite and in recently grown single crystals of volborthite suggesting it may already be realized in these materials.

Original languageEnglish (US)
Article number187205
JournalPhysical review letters
Volume111
Issue number18
DOIs
StatePublished - Nov 1 2013
Externally publishedYes

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liquid crystals
ground state
symmetry
liquids
monopoles
low concentrations
single crystals
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Striped spin liquid crystal ground state instability of kagome antiferromagnets. / Clark, Bryan K.; Kinder, Jesse M.; Neuscamman, Eric; Chan, Garnet Kin Lic; Lawler, Michael J.

In: Physical review letters, Vol. 111, No. 18, 187205, 01.11.2013.

Research output: Contribution to journalArticle

Clark, Bryan K. ; Kinder, Jesse M. ; Neuscamman, Eric ; Chan, Garnet Kin Lic ; Lawler, Michael J. / Striped spin liquid crystal ground state instability of kagome antiferromagnets. In: Physical review letters. 2013 ; Vol. 111, No. 18.
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