Exact solution of the one-dimensional fermionic model with correlated hopping |
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Authors: | A Schadschneider Gang Su J Zittartz |
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Institution: | 1. Institut für Theoretische Physik, Universit?t zu K?ln, Zülpicher Strasse 77, D-a50937, K?ln, Germany
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Abstract: | We extend the Bethe Ansatz solution of a onedimensional integrable fermionic model with correlated hopping to the parameter regime Δ t > 1. It is found that the model is equivalent to one with interaction 2 ? Δ t, but with twisted boundary conditions. Apart from the ground state energy we investigate the low-lying excitations and the asymptotic behaviour of the correlation functions. As in the ease of Δt < 1 we find dominating superconducting correlations for small doping. The behaviour in this regime therefore differs from that of the non-integrable model with symmetric bond-charge interaction (Hirsch model). |
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