A Gaudin-like determinant for overlaps of N\'eel and XXZ Bethe states
  We derive a determinant expression for overlaps of Bethe states of the XXZ spin chain with the N{\'e}el state, the ground state of the system in the antiferromagnetic Ising limit. Our formula, of determinant form, is valid for generic system size. Interestingly, it is remarkably similar to the well-known Gaudin formula for the norm of Bethe states, and to another recently-derived overlap formula appearing in the Lieb-Liniger model. 
Michael Brockmann, Jacopo De Nardis, Bram Wouters, Jean-S\'ebastien   Caux
cond-mat.stat-mech math-ph math.MP