Novel massless phase of Haldane-gap antiferromagnets in magnetic field

Abstract

The behavior of Haldane-gap antiferromagnets in strong magnetic field is not universal. While the low-energy physics of the conventional 1D spin-1 Heisenberg model in its magnetized regime is described by one incommensurate soft mode, other systems with somewhat perturbed coupling constants can possess two characteristic soft modes in a certain range of the field strength. Such a {\em two}-component Lutinger liquid phase is realised above the massive Haldane-gap phase, and in general above any massive nonmagnetic phase, when the ground state exhibits short range incommensurate fluctuations already in the absence of the field.

4 pages, 2 eps figures, to appear in Phys Rev B: Rapid Communications

References in corpus (1)

• Incommensurate spin correlations in Heisenberg spin-1/2 zig-zag ladders

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