Weakly-correlated systems are qualitatively well described as individual electrons. The wavefunction is well approximated as a short expansion of Slater determinants. For strongly-correlated systems this is not the case: many Slater determinants contribute substantially to the wavefunction and therefore the correct physical picture is not individual electrons. To better model strongly-correlated systems we are working with eigenvectors of exactly solvable models that qualitatively describe their first-order behaviour. In particular, we will present results using isotropic Richardson-Gaudin states which represent weakly-correlated (Cooper) pairs of electrons. Systematic corrections are straightforward (though technically difficult).

Richardson-Gaudin geminal mean-field for strong electronic correlation

ACS Spring 2022

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