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KR slave bosons<br />
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KR functional<br />
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●<br />
●<br />
Mean field (saddle point) approximation – Exact in<br />
d=∞ and reduces to Gutzwiller variational approach<br />
Provides a perturbative extension to the GVA<br />
Contrast: Barnes-Coleman-Read slave bosons are<br />
best for impurity models (N--> ∞).<br />
Kotliar and Ruckenstein, PRL 57 (1986) 1362.<br />
Lavagna PRB 41 (1990) 142.<br />
Powell cond-mat/0906.1640v7.
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