Abstract
The exact solution of the problem of the ground state of theXY-spin system on a deformed chain is found. At finite magnetizationm it is characterized by the double periodic structure and has a finite-band spectrum of spin excitations. Atm ≠ 0 the phase transition from the incommensurate into the dimerized state is accompanied by the soliton lattice formation.
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Brazovsky, S., Dzyaloshinsky, I. Exactly solvable XY model of the spin Peierls transition. J Stat Phys 38, 115–124 (1985). https://doi.org/10.1007/BF01017852
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DOI: https://doi.org/10.1007/BF01017852