Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models

Details Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models

2005-12-13

arxiv.org/abs/cond-mat/0512272v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages and 5 figures

Scientific paper

10.1103/PhysRevB.73.134429

From general arguments, that are valid for spin models with sufficiently short-range interactions, we derive strong constraints on the excitation spectrum across a continuous phase transition at zero temperature between a magnetic and a dimerized phase, that breaks the translational symmetry. From the different symmetries of the two phases, it is possible to predict, at the quantum critical point, a branch of gapless excitations, not described by standard semi-classical approaches. By using these arguments, supported by intensive numerical calculations, we obtain a rather convincing evidence in favor of a first-order transition from the ferromagnetic to the dimerized phase in the two-dimensional spin-half model with four-spin ring-exchange interaction, recently introduced by A.W. Sandvik et al. [Phys. Rev. Lett. 89, 247201 (2002)].

Affiliated with

Also associated with

No associations

Rating

Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-36077