Novel massless phase of Haldane-gap antiferromagnets in magnetic field

Details Novel massless phase of Haldane-gap antiferromagnets in magnetic field Novel massless phase of Haldane-gap antiferromagnets in magnetic field

1998-10-20

arxiv.org/abs/cond-mat/9810259v1

Physics

Condensed Matter

Statistical Mechanics

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

Scientific paper

10.1103/PhysRevB.58.R14709

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.

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