Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-10-05
J.Phys. Soc. Jpn. 73 (2004) 3008.
Physics
Condensed Matter
Statistical Mechanics
11 pages, 3 figures, 3 authors
Scientific paper
10.1143/JPSJ.73.3008
Transition rates and dynamic spin structure factor at zero temperature for the spin-1/2 XXZ chain at critical regime in a magnetic field are numerically evaluated in terms of the exact determinant representations for the form factors and norms of the Bethe eigenstates. We have seen that the transition rates converges toward the constant function with the value 1 in the limit delta -> 0. The observed critical exponent of the singularity at the lower boundary is compared with the one predicted from the comformal field theory. We confirm that they are in good agreement. Further we have discovered that a small peak emerges near the upper boundary in the line shape of S(q,omega) for 0
Sato Jun
Shiroishi Masahiro
Takahashi Minoru
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