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    Chapter and Conference Paper

    Low-Dimensional Spin Systems: Hidden Symmetries, Conformal Field Theories and Numerical Checks

    We review here some general properties of antiferromagnetic Heisenberg spin chains, emphasizing and discussing the rôle of hidden symmetries in the classification of the various phases of the models. We presen...

    C. Degli Esposti Boschi, E. Ercolessi, G. Morandi in Symmetries in Science XI (2005)

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    Chapter and Conference Paper

    An introduction to the Hubbard model

    In these notes we review some of the basic features of the 2D Hubbard model, thought of as the appropriate model for the description of the Cu — O planes in the cuprate superconductors. We discuss breifly the wea...

    E. Ercolessi, G. Morandi, P. Pieri in Strongly Correlated Magnetic and Supercond… (1997)