title: Projected-wave-function study of the spin-1/2 Heisenberg model on the Kagomé lattice.
abstract: 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).
authors.affiliation: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Ran
authors.forename: Michael
authors.initials: M
authors.lastname: Hermele
authors.forename: Patrick A
authors.initials: PA
authors.lastname: Lee
authors.forename: Xiao-Gang
authors.initials: XG
authors.lastname: Wen