Abstract
The S= 1 2 quantum Heisenberg antiferromagnet on the square lattice in a uniform arbitrary magnetic field is studied by means of quantum Monte Carlo simulations. The applied field induces an effective easy-plane anisotropy and consequently a Berezhinskii–Kosterlitz–Thouless (BKT) transition: the expected BKT behaviour is observed to persist both in the limit of vanishing field and near the saturation field. Experimental implications are discussed.
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