Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-08-20
J.Phys.A31:61-71,1998
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, LaTeX, uses ioplppt.sty and epsfig.sty, figure 3 corrected
Scientific paper
10.1088/0305-4470/31/1/011
We investigate the anisotropic integrable spin chain consisting of spins $s={1/2}$ and $s=1$ by means of thermodynamic Bethe ansatz for the anisotropy $\gamma>\pi/3$, where the analysis of the Takahashi conditions leads to a more complicated string picture. We give the phase diagram with respect to the two real coupling constants $\bar{c}$ and $\tilde{c}$, which contains a new region where the ground state is formed by strings with infinite Fermi zones. In this region the velocities of sound for the two physical excitations have been calculated from the dressed energies. This leads to an additional line of conformal invariance not known before.
Doerfel Bernd-Dietrich
Meissner St.
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