Abstract : The four site Hubbard model is considered from the exact diagonalization and variational method points of view. We show that a symmetry projected mean-field theory recovers the exact ground state energy, irrespective of the interaction strength, in contrast to the conventional Gutzwiller wave-function that will be also considered.
Type de document :
Communication dans un congrès
Computational Challenges in Nuclear and Many-Body Physics, Sep 2014, Stockholm, Sweden
http://hal.in2p3.fr/in2p3-01073840
Contributeur : Sandrine Guesnon
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Soumis le : vendredi 10 octobre 2014 - 15:12:32
Dernière modification le : jeudi 11 octobre 2018 - 11:28:04
A. Leprévost. Exact ground state of strongly correlated electron systems from symmetry-restored wave-functions. Computational Challenges in Nuclear and Many-Body Physics, Sep 2014, Stockholm, Sweden. 〈in2p3-01073840〉
