Theory of the field-induced gap in S=1/2 antiferromagnetic chains
Masaki Oshikawa, Ian Affleck
Abstract
In a recent neutron-scattering experiment on the quasi-one-dimensional S=1/2 antiferromagnet Cu Benzoate, a gap was induced by an applied magnetic field. We argue that the primary mechanism of the gap formation is an effective staggered field due to both the alternating g-tensor and the Dzyaloshinskii-Moriya interaction. We explain the dependence of the gap on the applied field, as well as identify several peaks in the structure factor S(q,ω).
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