ar X iv : h ep - t h / 97 07 07 4 v 1 8 J ul 1 99 7 From Fusion Hierarchy to Excited State TBA
نویسندگان
چکیده
Functional relations among the fusion hierarchy of quantum transfer matrices give a novel derivation of the TBA equations, namely without string hypothesis. This is demonstrated for two important models of 1D highly correlated electron systems, the supersymmetric t − J model and the supersymmetric extended Hubbard model. As a consequence, " the excited state TBA " equations, which characterize correlation lengths, are explicitly derived for the t − J model. To the authors' knowledge, this is the first explicit derivation of excited state TBA equations for 1D lattice electron systems.
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