Exact calculation of the ground-state dynamical spin correlation function of a S=1/2 antiferromagnetic Heisenberg chain with free spinons
Abstract
We calculate the exact dynamical magnetic structure factor S(Q,E) in the ground state of a one-dimensional S=1/2 antiferromagnet with gapless free S=1/2 spinon excitations, the Haldane-Shastry model with inverse-square exchange, which is in the same low-energy universality class as Bethe's nearest-neighbor exchange model. Only two-spinon excited states contribute, and S(Q,E) is found to be a very simple integral over these states.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 1993
- DOI:
- 10.1103/PhysRevLett.71.4055
- arXiv:
- arXiv:cond-mat/9309039
- Bibcode:
- 1993PhRvL..71.4055H
- Keywords:
-
- 75.10.Jm;
- 71.10.+x;
- Quantized spin models;
- Condensed Matter;
- High Energy Physics - Theory
- E-Print:
- 11 pages, LaTeX, RevTeX 3.0, cond-mat/9309039