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Marchetto, Enrico; Sfondrini, Alessandro; Yang, Zhou
Physical review letters, 03/2020, Letnik: 124, Številka: 10Journal Article
We consider current-current deformations that generalize T ¯ T ones, and show that they may be also introduced for integrable spin chains. In analogy with the integrable QFT setup, we define the deformation as a modification of the S matrix in the Bethe equations. Using results by Bargheer, Beisert and Loebbert we show that the deforming operator is composite and constructed out of two currents on the lattice; its expectation value factorizes like for T ¯ T . Such a deformation may be considered for any combination of charges that preserve the model's integrable structure.
