Phys. Rev. B 75, 174520 (2007) [6 pages]Lorentz covariance and the crossover of two-dimensional antiferromagnetsReceived 23 November 2006; published 22 May 2007 We derive a lattice β function for the two-dimensional antiferromagnetic Heisenberg model, which allows the lattice interaction couplings of the nonperturbative quantum Monte Carlo vacuum to be related directly to the zero-temperature fixed points of the nonlinear sigma model in the presence of strong interplanar and spin anisotropies. In addition to the usual renormalization of the gapful disordered state in the vicinity of the quantum critical point, we show that this leads to a chiral doubling of the spectra of excited states. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.174520
DOI:
10.1103/PhysRevB.75.174520
PACS:
75.10.Jm, 75.40.Cx
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