1107.2896v3.pdf (274.12 kB)
Destruction of valence-bond order in a S=1/2 sawtooth chain with a Dzyaloshinskii-Moriya term
journal contribution
posted on 2018-08-07, 13:28 authored by Zhihao Hao, Yuan Wan, Ioannis RousochatzakisIoannis Rousochatzakis, Julia Wildeboer, A. Seidel, Frederic Mila, O. TchernyshyovA 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.
History
School
- Science
Department
- Physics
Published in
Physical Review B - Condensed Matter and Materials PhysicsVolume
84Issue
9Citation
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.Publisher
© 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
2011Notes
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.84.094452ISSN
1098-0121eISSN
1550-235XPublisher version
Language
- en