Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-04-15
Phys. Rev. B 84, 020413(R) (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, v2: printable figs, v3: publ. version
Scientific paper
We argue that the spin-wave breakdown in the Heisenberg kagome antiferromagnet signals an instability of the ground state and leads, through an emergent local constraint, to a quantum dynamics described by a gauge theory similar to that of chromodynamics. For integer spins, we show that the quantum fluctuations of the gauge modes select the sqrt(3)xsqrt(3) Neel state with an on-site moment renormalized by color resonances. We find non-magnetic low-energy excitations that may be responsible for a deconfinement "transition" at experimentally accessible temperatures which we estimate.
Cepas Olivier
Ralko Arnaud
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