On the symmetries of the Hubbard model: application to finite-size clusters |
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Authors: | Mario Cuoco Canio Noce Alfonso Romano |
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Institution: | 1.Dipartimento di Fisica Teorica e S.M.S.A. and Istituto Nazionale della Fisica della Materia,Università di Salerno,Baronissi (SA),Italy |
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Abstract: | We evaluate the density of states of the Hubbard model at half filling on a four-site cluster with periodic boundary conditions. The results are obtained from an exact diagonalization study of the model, where theSU(2) symmetry, the Yang\(\widetilde{SU}(2)\) pseudospin symmetry and the translational invariance of the Hamiltonian are explicitly taken into account. |
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