Abstract
In this contribution we discuss the thermodynamic behaviour of Hubbard chains with an additional site-diagonal interaction. It is shown rigorously that the strong coupling limit is equivalent to a generalized anisotropic Heisenberg system, which in some recently discussed limiting cases degenerates to an Ising orX-Y system. The whole procedure also works for a collection of chains with interchain interaction, thus it is not restricted to strictly one-dimensional systems. The effect of a magnetic field is discussed, and the results are compared with a recent perturbation approach by using numerical results for the anisotropic Heisenberg chain.
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Brandt, U. Thermodynamic properties of extended Hubbard chains. Z Physik B 22, 397–399 (1975). https://doi.org/10.1007/BF01312812
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DOI: https://doi.org/10.1007/BF01312812