On the critical behaviour of the integrable $q$-deformed $OSp(3|2)$ superspin chain

Abstract

This paper is concerned with the investigation of the massless regime of an integrable spin chain based on the quantum group deformation of the $OSp(3|2)$ superalgebra. The finite-size properties of the eigenspectra are computed by solving the respective Bethe ansatz equations for large system sizes allowing us to uncover the low-lying critical exponents. We present evidences that critical exponents appear to be built in terms of composites of anomalous dimensions of two Coulomb gases with distinct radii and the exponents associated to $Z(2)$ degrees of freedom. This view is supported by the fact that the $S=1$ XXZ integrable chain spectrum is present in some of the sectors of our superspin chain at a particular value of the deformation parameter. We find that the fine structure of finite-size effects is very rich for a typical anisotropic spin chain. In fact, we argue on the existence of a family of states with the same conformal dimension whose lattice degeneracies are apparently lifted by logarithmic corrections. On the other hand we also report on states of the spectrum whose finite-size corrections seem to be governed by a power law behaviour. We finally observe that under toroidal boundary conditions the ground state dependence on the twist angle has two distinct analytical structures.

arXiv comment61 pages, 54 figures

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• Integrable boundary conditions for staggered vertex models
• $OSp(n|2m)$ quantum chains with free boundaries
• Flag Integrable Models and Generalized Graded Algebras
• $U_q[OSp(3|2)]$ quantum chains with quantum group invariant boundaries
• Quantum-group-invariant $D_{n+1}^{(2)}$ models: Bethe ansatz and finite-size spectrum