The behavior of Haldane-gap antiferromagnets in a strong magnetic field is not universal. While the low-energy physics of the conventional one-dimensional 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 two-component Luttinger liquid phase is realized 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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jan 1 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics