Optimized RVB states of the 2-d antiferromagnet: Ground state and excitation spectrum
نویسنده
چکیده
The Gutzwiller projection of the Schwinger-boson mean-field solution of the 2-d spin-1/2 antiferromagnet in a square lattice is shown to produce the optimized, parameter-free RVB ground state. We get −0.6688J/site and 0.311 for the energy and the staggered magnetization. The spectrum of the excited states is found to be linear and gapless near k ∼= 0. Our calculation suggests, upon breaking of the rotational symmetry, ǫk ∼= 2JZr √
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