Boundary overlap in the open XXZ spin chain

Abstract

In this paper we compute the overlaps of the ground states for the open spin chains after a change of one of the boundary magnetic fields. It can be considered as the first step toward the study of the boundary quench problem: behaviour of an open spin chain after an abrupt change of one boundary magnetic field.

30 pages SciPost submission, v3: minor changes following referee reports, appendix added

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