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Boundary overlap in the open XXZ spin chain

Charbel Abetian, Nikolai Kitanine, Veronique Terras

SciPost Phys. 18, 026 (2025) · published 21 January 2025

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.


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