Integrable spin-boson interaction in the Tavis-Cummings model from a generic boundary twist

Details Integrable spin-boson interaction in the Tavis-Cummings model from a generic boundary twist Integrable spin-boson interaction in the Tavis-Cummings model from a generic boundary twist

2003-09-29

arxiv.org/abs/cond-mat/0309680v2

Eur.Phys.J. B43 (2005) 387

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, revtex; 1 figure. To be published in EPJB

Scientific paper

10.1140/epjb/e2005-00068-8

We construct models describing interaction between a spin $s$ and a single bosonic mode using a quantum inverse scattering procedure. The boundary conditions are generically twisted by generic matrices with both diagonal and off-diagonal entries. The exact solution is obtained by mapping the transfer matrix of the spin-boson system to an auxiliary problem of a spin-$j$ coupled to the spin-$s$ with general twist of the boundary condition. The corresponding auxiliary transfer matrix is diagonalized by a variation of the method of $Q$-matrices of Baxter. The exact solution of our problem is obtained applying certain large-$j$ limit to $su(2)_j$, transforming it into the bosonic algebra.

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