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Exact ground state of strongly correlated electron systems from symmetry-entangled wave-functions

Abstract : The four-site Hubbard model is considered from the exact diagonalisation and variational method points of view. It is shown that the exact ground-state can be recovered by a symmetry projected Slater determinant, irrespective of the interaction strength. This is in contrast to the Gutzwiller wave-function, which is calculated as well.
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Submitted on : Monday, January 26, 2015 - 10:34:40 AM
Last modification on : Tuesday, February 19, 2019 - 10:04:10 AM

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A. Leprevost, O. Juillet, R. Fresard. Exact ground state of strongly correlated electron systems from symmetry-entangled wave-functions. Annalen der Physik, 2014, 526 (9-10), pp.430-436. ⟨10.1002/andp.201400129⟩. ⟨in2p3-01109338⟩

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