Contributor info: Prof. Nikolai Kitanine

Charbel Abetian, Nikolai Kitanine, Veronique Terras

SciPost Phys. 18, 026 (2025) · published 21 January 2025 | Toggle abstract · pdf

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.

Nikolai Kitanine, Giridhar Kulkarni

SciPost Phys. 6, 076 (2019) · published 25 June 2019 | Toggle abstract · pdf

In this paper we propose a method based on the algebraic Bethe ansatz leading to explicit results for the form factors of quantum spin chains in the thermodynamic limit. Starting from the determinant representations we retrieve in particular the formula for the two-spinon form factors for the isotropic XXX Heisenberg chain obtained initially in the framework of the $q$-vertex operator approach.