Abstract
Despite its conceptional simplicity the Hubbard model provides a complicated interacting many-electron problem which, in general, cannot be solved exactly. Therefore, approximate methods are employed which are presumed to give a qualitatively correct picture of the physics contained in the model. Here we are interested in the metal—insulator transition and other phenomena beyond perturbation theory. Hence, we have to design feasible non-perturbative approaches that also allow for the description of possible phase transitions.
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© 1997 Springer-Verlag Berlin Heidelberg
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Gebhard, F. (1997). Approximate Methods. In: The Mott Metal-Insulator Transition. Springer Tracts in Modern Physics, vol 137. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-14858-2_3
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DOI: https://doi.org/10.1007/3-540-14858-2_3
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