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Destruction of valence-bond order in a S=1/2 sawtooth chain with a Dzyaloshinskii-Moriya term

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posted on 07.08.2018 by Zhihao Hao, Yuan Wan, Ioannis Rousochatzakis, Julia Wildeboer, A. Seidel, Frederic Mila, O. Tchernyshyov
A small value of the spin gap in quantum antiferromagnets with strong frustration makes them susceptible to nominally small deviations from the ideal Heisenberg model. One such perturbation, the anisotropic Dzyaloshinskii-Moriya (DM) interaction, is an important perturbation for the S=1/2 kagome antiferromagnet, one of the current candidates for a quantum-disordered ground state. We study the influence of the DM term in a related one-dimensional system, the sawtooth chain, which has valence-bond order in its ground state. Through a combination of analytical and numerical methods, we show that a relatively weak DM coupling, 0.115J, is sufficient to destroy the valence-bond order, close the spin gap, and turn the system into a Luttinger liquid with algebraic spin correlations. A similar mechanism may be at work in the kagome antiferromagnet. © 2011 American Physical Society.

Funding

Y.W. was supported by William Bently Gardner. A.S. and J.W. were supported by the National Science Foundation under NSF Grant No. DMR-0907793.

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  • Science

Department

  • Physics

Published in

Physical Review B - Condensed Matter and Materials Physics

Volume

84

Issue

9

Citation

HAO, Z. ... et al., 2011. Destruction of valence-bond order in a S=1/2 sawtooth chain with a Dzyaloshinskii-Moriya term. Physical Review B - Condensed Matter and Materials Physics, 84: 094452.

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© American Physical Society (APS)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2011

Notes

This paper was accepted for publication in the journal Physical Review B - Condensed Matter and Materials Physics and the definitive published version is available at https://doi.org/10.1103/PhysRevB.84.094452

ISSN

1098-0121

eISSN

1550-235X

Language

en

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