Schwinger-boson approach to quantum spin systems: Gaussian fluctuactions in the "natural" gauge

Details Schwinger-boson approach to quantum spin systems: Gaussian fluctuactions in the "natural" gauge Schwinger-boson approach to quantum spin systems: Gaussian fluctuactions in the "natural" gauge

1996-11-12

arxiv.org/abs/cond-mat/9611097v2

Phys.Rev.Lett.78, 2216 (1997)

Physics

Condensed Matter

Statistical Mechanics

4 pages, Latex, 3 figures included as eps files,minor corrections

Scientific paper

10.1103/PhysRevLett.78.2216

We compute the Gaussian-fluctuation corrections to the saddle-point Schwinger-boson results using collective coordinate methods. Concrete application to investigate the frustrated J1-J2 antiferromagnet on the square lattice shows that, unlike the saddle-point predictions, there is a quantum nonmagnetic phase for 0.53 < J2/J1 < 0.64. This result is obtained by considering the corrections to the spin stiffness on large lattices and extrapolating to the thermodynamic limit, which avoids the infinite-lattice infrared divergencies associated to Bose condensation. The very good agreement of our results with exact numerical values on finite clusters lends support to the calculational scheme employed.

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