Projected-wave-function study of the spin-1/2 Heisenberg model on the Kagomé lattice

Phys Rev Lett. 2007 Mar 16;98(11):117205. doi: 10.1103/PhysRevLett.98.117205. Epub 2007 Mar 16.


We perform a Gutzwiller projected-wave-function study for the spin-1/2 Heisenberg model on the Kagomé lattice to compare energies of several spin-liquid states. The result indicates that a U(1)-Dirac spin-liquid state has the lowest energy. Furthermore, even without variational parameters, the energy turns out to be very close to that found by exact diagonalization. We show that such a U(1)-Dirac state represents a quantum phase whose low-energy physics is governed by four flavors of two-component Dirac fermions coupled to a U(1) gauge field. These results are discussed in the context of recent experiments on ZnCu(3)(OH)(6)Cl(2).

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.