1993/11/15 by E. Sorensen, Erik S. So/rensen, Ian Affleck +1 · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat
paper · pdf · doi:10.1103/physrevb.49.13235
11 pages, 3 postscript figures included, REVTEX 3.0, UBCTP-93-022
arxiv created 1993/11/15 · openalex publication_date 1994/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The structure function, S(k), for the s=1, Haldane gap antiferromagnetic chain, is measured accurately using the recent density matrix renormalization group method, with chain-length 100. Excellent agreement with the nonlinear σ model prediction is obtained, both at k≈ π where a single magnon process dominates and at k≈ 0 where a two magnon process dominates. We repeat our calculation with crystal field anisotropy chosen to model NENP, obtaining good agreement with both field theory predictions and recent experiments. Correlation lengths, gaps and velocities are determined for both polarizations.