A phason disordered two dimensional quantum antiferromagnet

Details A phason disordered two dimensional quantum antiferromagnet A phason disordered two dimensional quantum antiferromagnet

2009-01-28

arxiv.org/abs/0901.4441v1

Phys. Rev. B 79, 172406 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 7 figures

Scientific paper

We examine a novel type of disorder in quantum antiferromagnets. Our model consists of localized spins with antiferromagnetic exchanges on a bipartite quasiperiodic structure, which is geometrically disordered in such a way that no frustration is introduced. In the limit of zero disorder, the structure is the perfect Penrose rhombus tiling. This tiling is progressively disordered by augmenting the number of random "phason flips" or local tile-reshuffling operations. The ground state remains N\'eel ordered, and we have studied its properties as a function of increasing disorder using linear spin wave theory and quantum Monte Carlo. We find that the ground state energy decreases, indicating enhanced quantum fluctuations with increasing disorder. The magnon spectrum is progressively smoothed, and the effective spin wave velocity of low energy magnons increases with disorder. For large disorder, the ground state energy as well as the average staggered magnetization tend towards limiting values characteristic of this type of randomized tilings.

Affiliated with

Also associated with

No associations

Rating

A phason disordered two dimensional quantum antiferromagnet 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 A phason disordered two dimensional quantum antiferromagnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A phason disordered two dimensional quantum antiferromagnet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-344697