- #1

gizzmo

- 2

- 0

0 0 -t -t

0 0 +t +t

-t +t 0 0

-t +t 0 0

the basis are |\uparrow,\downarrow>, |\downarrow,\uparrow>, |\uparrow\downarrow,0>, |0,\uparrow\downarrow>,

Why there is +t and -t? (I think that this has something to do with the fact the the fermionic wave function is antisymmetric. But can somebody give me an example how to calculate this elements from the actual Hamiltonian. I always get -t.)