A tensor-network optimized unitary transforms the Hubbard model into Heisenberg and t-J effective models, confirming the half-filling result J = 4t^2/U but with poor accuracy for doped systems.
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Mapping the Hubbard model to the t-J model using ground state unitary transformations
A tensor-network optimized unitary transforms the Hubbard model into Heisenberg and t-J effective models, confirming the half-filling result J = 4t^2/U but with poor accuracy for doped systems.