Dynamical Mean-Field Theory of Resonating Valence Bond Antiferromagnets

Details Dynamical Mean-Field Theory of Resonating Valence Bond Antiferromagnets Dynamical Mean-Field Theory of Resonating Valence Bond Antiferromagnets

2001-06-25

arxiv.org/abs/cond-mat/0106517v2

Phys. Rev. Lett. 87, 277203 (2001)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures; contains some clarifications on the role of the triplet states and the triplet gap

Scientific paper

10.1103/PhysRevLett.87.277203

We propose a theory of the spin dynamics of frustrated quantum antiferromagnets, which is based on an effective action for a plaquette embedded in a self-consistent bath. This approach, supplemented by a low-energy projection, is applied to the kagome antiferromagnet. We find that a spin-liquid regime extends to very low energy, in which local correlation functions have a slow decay in time, well described by a power law behaviour and $\omega/T$ scaling of the response function: $\chi''(\omega)\propto \omega^{-\alpha}F(\omega/T)$.

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