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A beautiful discussion of the physics of 1D quantum spin systems and the connections to the disordered flat phase of SOS models is given by den Nijs and Rommelse in Ref. 15. Relevant studies on quantum-spin chains are also: T. Kennedy and H. Tasaki, Commun. Math. Phys. 147, 431 (1992).
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The renormalization is performed by scaling the cutoff α→(Formula presented)α with l>0. See, for instance, T. Giamarchi and H. J. Schulz, J. Phys. (Paris) 49, 819 (1988).
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