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Original publication:

Title: Deformed strings in the Heisenberg model
Author(s): Rob Hagemans, Jean-S├ębastien Caux
As Contributors: Jean-S├ębastien Caux
Journal ref.: Journal of Physics A: Mathematical and Theoretical 40, 14605-14647
Date: 2007-11-21


We investigate solutions to the Bethe equations for the isotropic S = 1/2 Heisenberg chain involving complex, string-like rapidity configurations of arbitrary length. Going beyond the traditional string hypothesis of undeformed strings, we describe a general procedure to construct eigenstates including strings with generic deformations, discuss general features of these solutions and provide a number of explicit examples including complete solutions for all wavefunctions of short chains. We finally investigate some singular cases and show from simple symmetry arguments that their contribution to zero-temperature correlation functions vanishes.

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