Orateur
Description
In this talk, we consider a local quench in an open XXZ chain, induced by a change in one of the boundary fields, and study the exact computation of overlaps between eigenstates before and after the quench. For an open XXZ spin chain with diagonal boundary conditions, these overlaps admit a finite-volume representation in terms of a boundary version of Slavnov determinant. We briefly discuss, in this case, the thermodynamic limit of the overlaps between ground states in the massive antiferromagnetic regime of the chain, and then consider overlaps involving excited states with holes (joint work with C. Abetian and N. Kitanine). If time permits, we will also discuss a generalization of Slavnov's determinant representation for the overlaps to certain configurations of unparallel boundary fields (joint work with G. Niccoli).