Exactly solvable XY model of the spin Peierls transition
Abstract
The exact solution of the problem of the ground state of the XY-spin system on a deformed chain is found. At finite magnetization m it is characterized by the double periodic structure and has a finite-band spectrum of spin excitations. At m ≠ 0 the phase transition from the incommensurate into the dimerized state is accompanied by the soliton lattice formation.
- Publication:
-
Journal of Statistical Physics
- Pub Date:
- January 1985
- DOI:
- 10.1007/BF01017852
- Bibcode:
- 1985JSP....38..115B
- Keywords:
-
- Commensurability;
- finite-band potentials;
- solitons