Posted by Chris on April 30, 2014, 4:32 pm
Hello,
The Hamiltonian for the Hubbard interaction is an approximate representation of the Coulomb interaction between electrons.
The Hamiltonian you wrote down in equation 23.1 seems to suggest that electrons with spin up interact with electrons with spin down.
What happens with the interaction between an electron having spin up with another electron having spin up?
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