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5.4. VMC CALCULATIONS 125
0
l 0
=2
l 0
=4
0
-0.02
e C
-0.02
-0.04
-0.06
0 1 2 3 4 5
V 0
-0.04
0 1 2 3 4 5
V 0
Figure 5.5: Energy per lattice site of the RV B/J , SFP/J and BO/J wavefunctions
minus the energy of the projected Fermi sea wave-function.
e -e FS
0.04
0.02
0
-0.02
l 0
=4
0.4
∆ RVB
0
0 10
Kinetic energy
Exchange energy
-0.04
0 1 2 3 4 5 6 7
V 0
Figure 5.6: Kinetic and exchange energy per site of the RV B/J wave-function
minus the respective exchange and kinetic energy of the simple projected Fermi
sea. Inset: value of the variational d-wave gap.