James K. Freericks, Elliott H. Lieb, Daniel Ueltschi
Phase separation due to quantum mechanical correlations
(34K, revtex)

ABSTRACT.  Can phase separation be induced by strong electron correlations? 
We present a theorem that affirmatively answers this question in the 
Falicov-Kimball model away from half-filling, for any dimension. In the 
ground state the itinerant electrons are spatially separated from the 
classical particles.