Physics – Condensed Matter
Scientific paper
2000-11-27
J.Phys.A34:1073-1088,2001
Physics
Condensed Matter
19 pages, Rev Tex
Scientific paper
10.1088/0305-4470/34/6/301
SU(3)-invariant "spin" chains with a single impurity, such as a modified exchange coupling on one link, are analyzed using boundary conformal field theory techniques. These chains are equivalent to a special case of the "tJV" model, i.e. the t-J model with a nearest neighbour repulsion added. In the continuum limit they are equivalent to two free bosons at a special value of the compactification radii. The SU(3) symmetry, which is made explicit in this formulation, provides insight into the exact solution of a non-trivial boundary critical point found earlier in another formulation of this model as a theory of quantum Brownian motion.
Affleck Ian
Oshikawa Masaki
Saleur Hubert
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