J. Bunemann et al., GUTZWILLER-CORRELATED WAVE-FUNCTIONS FOR DEGENERATE BANDS - EXACT RESULTS IN INFINITE DIMENSIONS, Journal of physics. Condensed matter, 9(35), 1997, pp. 7343-7358
We introduce Gutzwiller-correlated wave functions for the variational
investigation of general multi-band Hubbard models. We set up a diagra
mmatic formalism which allows us to evaluate analytically ground-state
properties in the limit of infinite spatial dimensions. In this limit
recent results obtained within the Gutzwiller approximation are seen
to become exact for these wave functions. We further show that the sla
ve-boson mean-held theory for degenerate bands becomes variationally c
ontrolled at zero temperature in infinite dimensions. Lastly, we brief
ly comment on the variational approach to the Anderson transition in s
trongly correlated electron systems.