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196 APPENDIX B. A PAIR OF PARTICLES IN A CUO 4 CLUSTER
j MF Cu-O
K MF Cu-O
j MF O-O
K MF O-O
Figure B.3: Mean-field operators ĵ MF and ˆK MF measured in a variational wavefunction
with flux variational parameters α 1 and α 2 (see text). The long-dashed
box indicates the region of parameters that lead to an energy optimization in the
3-band Hubbard model. α 1 and α 2 are in units of 2π.