I've calculated the eigenstates of the Hubbard Hamiltonian for two fermions.(adsbygoogle = window.adsbygoogle || []).push({});

The ground state is (U^{2}- (U^{2}+ 16t^{2})^{1/2})/2

For U = infty, I get 0.

For U >> t, I should get the exchange energy J = -4t^{2}/U

How do I get from the ground state equation to J?

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# I Limit of large but finite

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