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A deformed analogue of Onsager's symmetry in the XXZ open spin chain

Pascal Baseilhac and Kozo Koizumi

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The XXZ open spin chain with general integrable boundary conditions is shown to possess a q-deformed analogue of the Onsager's algebra as fundamental non-Abelian symmetry which ensures the integrability of the model. This symmetry implies the existence of a finite set of independent mutually commuting nonlocal operators which form an Abelian subalgebra. The transfer matrix and local conserved quantities, for instance the Hamiltonian, are expressed in terms of these nonlocal operators. It follows that Onsager's original approach of the planar Ising model can be extended to the XXZ open spin chain.


Keywords

algebraic structures of integrable models

integrable spin chains (vertex models)

symmetries of integrable models

 

E-print Number: hep-th/0507053

Cited: by |

Refers: to

PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

02.30.Ik Integrable systems

02.10.-v Logic, set theory, and algebra

MSC

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs

46J30 Subalgebras

Subjects

Mathematical physics

Statistical physics and nonlinear systems

Dates

Issue 10 (October 2005)

Received 6 July 2005, accepted for publication 8 September 2005

Published 7 October 2005



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