We consider multi-point correlation functions in the open XXZ chain with longitudinal boundary fields and in a uniform external magnetic field. We show that, at finite temperature, these correlation functions can be written in the quantum transfer matrix framework as sums over thermal form factors.
We derive compact multiple integral formulae for several physical spin correlation functions in the semi-infinite XXZ chain with a longitudinal boundary magnetic field.
On correlation functions for the open XXZ chain with non ... - SciPost
XXZ chain correlation functions are mathematical representations that describe the statistical relationship between spin orientations at different lattice sites within a one-dimensional quantum Heisenberg model.
In this section we explain in more detail our general procedure to compute correlation functions of the XXZ chain in the algebraic Bethe ansatz framework, along the lines described in Section 1.
Correlation functions of the XXZ Heisenberg spin-12 chain in a magnetic ...
Our purpose is here to compute boundary correlation functions at zero temperature, or more precisely the mean values in the ground state of local operators on the first m sites of the chain.
Very little is known about the correlation function of XXZ chain at the ground state. Hulthen calculated the ground state energy for the case ∆ = 1 and obtained the nearest-neighbor correlation [9]
framework of the (algebraic) Bethe ansatz for boundary integrable models [93–105]. For this purpose, we will consider the example of the finite XXZ spin-1/2 Heisenberg chain with diagonal boundary conditions, including in particular non-zer.