Physics – Condensed Matter
Scientific paper
1993-11-09
Physics
Condensed Matter
11 pages, 3 postscript figures included, REVTEX 3.0, UBCTP-93-022
Scientific paper
10.1103/PhysRevB.49.13235
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 $\sigma$ model prediction is obtained, both at $k\approx \pi$ where a single magnon process dominates and at $k\approx 0$ 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.
Affleck Ian
Sorensen Erik
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