We revisit the so-called folded XXZ model, which was treated earlier by two independent
research groups. We argue that this spin-1/2 chain is one of the simplest quantum integrable …

A general method is proposed for constructing the Bethe ansatz equations of integrable
models without U (1) symmetry. As an example, the exact spectrum of the XXZ spin ring with …

We address the question of the dependence of the bulk free energy on boundary conditions
for the six-vertex model. Here we compare the bulk free energy for periodic and domain wall …

Employing the off-diagonal Bethe ansatz method proposed recently by the present authors,
we exactly diagonalize the XXX spin chain with arbitrary boundary fields. By constructing a …

The anisotropic spin-1 2 chains with arbitrary boundary fields are diagonalized with the off-
diagonal Bethe ansatz method. Based on the properties of the R-matrix and the K-matrices …

In this paper we consider the spin-1/2 highest weight representations for the 6-vertex Yang–
Baxter algebra on a finite lattice and analyze the integrable quantum models associated to …

The integrable quantum models, associated with the transfer matrices of the 6-vertex
reflection algebra for spin-1/2 representations, are studied in this paper. In the framework of …

We study a quantum Ising chain with tailored bulk dissipation, which can be mapped onto a
non-Hermitian Ashkin-Teller model. By exploiting the Kohmoto-den Nijs-Kadanoff …

The purpose of this paper is two-fold. First, we discuss the existence of solutions to the anti-
periodic boundary value problem aut (t; x)+ Au (t; x)− bu (t; x)+ f (u (t; x)) h (t; x);(1.1 a) u (0; …

We consider the six-vertex model on an N× N square lattice with the domain wall boundary
conditions. Boundary one-point correlation functions of the model are expressed as …