Open t-J chain with boundary impurities

TL;DR

This paper investigates integrable boundary conditions for the supersymmetric t-J model with impurities, deriving the spectrum using algebraic Bethe Ansatz, and exploring the effects of boundary impurities on correlated electron systems.

Contribution

It introduces new integrable boundary conditions involving dynamical impurities with internal degrees of freedom in the supersymmetric t-J model.

Findings

Spectrum of the Hamiltonian obtained via algebraic Bethe Ansatz

Boundary impurities allow double occupation of local orbitals

Enhanced understanding of boundary effects in correlated electron models

Abstract

We study integrable boundary conditions for the supersymmetric t-J model of correlated electrons which arise when combining static scattering potentials with dynamical impurities carrying an internal degree of freedom. The latter differ from the bulk sites by allowing for double occupation of the local orbitals. The spectrum of the resulting Hamiltonians is obtained by means of the algebraic Bethe Ansatz.