Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange

Details Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange

2002-06-06

arxiv.org/abs/cond-mat/0206081v2

Phys. Rev. B 66, 134423 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures, some minor changes in text and references

Scientific paper

10.1103/PhysRevB.66.134423

The isotropic S=1/2 antiferromagnetic spin ladder with additional four-spin ring exchange is studied perturbatively in the strong coupling regime with the help of cluster expansion technique, and by means of bosonization in the weak coupling limit. It is found that a sufficiently large strength of ring exchange leads to a second-order phase transition, and the shape of the boundary in the vicinity of the known exact transition point is obtained. The critical exponent for the gap is found to be $\eta\simeq1$, in agreement both with exact results available for the dimer line and with the bosonization analysis. The phase emerging for high values of the ring exchange is argued to be gapped and spontaneously dimerized. The results for the transition line from strong coupling and from weak coupling match with each other naturally.

Affiliated with

Also associated with

No associations

Rating

Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange 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 Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-435584