Phys. Rev. Lett. 87, 277203 (2001) [4 pages]Dynamical Mean-Field Theory of Resonating-Valence-Bond AntiferromagnetsReceived 25 June 2001; published 13 December 2001 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 Kagomé 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 power-law behavior and ω/T scaling of the response function: χ′′(ω)∝ω-αF(ω/T). © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.277203
DOI:
10.1103/PhysRevLett.87.277203
PACS:
75.10.Jm, 75.10.Nr, 75.40.Gb
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