Complete phase diagram for the integrable chain with alternating spins in the sectors with competing interactions

Details Complete phase diagram for the integrable chain with alternating spins in the sectors with competing interactions Complete phase diagram for the integrable chain with alternating spins in the sectors with competing interactions

1997-08-20

arxiv.org/abs/hep-th/9708107v2

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.

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