Phase transitions in the one-dimensional spin-S J(1)-J(2) XY model - art. no. 174426

The one-dimensional spin-S J(1)-J(2) XY model is studied within the bosoniz ation approach. Around the two limits (J(2)/J(1)much less than1, J(2)/J(1)m uch greater than1) where a field theoretical analysis can be derived, we di scuss the phases as well as the different phase transitions that occur in t he model. In particular, it is found that the chiral critical spin nematic phase, discovered by Nersesyan et al. [Phys. Rev. Lett. 81, 910 (1998)] for S=1/2, exists in the general spin-S case. The nature of the effective-fiel d theory that describes the transition between this chiral critical phase a nd a chiral gapped phase is also determined.