Exactly solvable XY model of the spin Peierls transition |
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| Authors: | S. Brazovsky I. Dzyaloshinsky |
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| Affiliation: | (1) L. D. Landau Institute for Theoretical Physics, USSR Academy of Sciences, ul.Kosygina 2, 117334 Moscow, USSR |
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| 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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| Keywords: | Commensurability finite-band potentials solitons |
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