تقرير
Destruction of valence-bond order in a $S=1/2$ sawtooth chain with a Dzyaloshinskii-Moriya term
| العنوان: | Destruction of valence-bond order in a $S=1/2$ sawtooth chain with a Dzyaloshinskii-Moriya term |
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| المؤلفون: | Hao, Zhihao, Wan, Yuan, Rousochatzakis, Ioannis, Wildeboer, Julia, Seidel, A., Mila, F., Tchernyshyov, O. |
| المصدر: | Phys.Rev.B84:094452,2011 |
| سنة النشر: | 2011 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | 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 of such perturbations, the anisotropic Dzyaloshinskii-Moriya 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 that 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. Comment: 11 pages. References added. Revisions made as requested by referees |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.84.094452 |
| URL الوصول: | http://arxiv.org/abs/1107.2896 |
| رقم الأكسشن: | edsarx.1107.2896 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.84.094452 |
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