We study metal-insulator transitions between Mott insulators and metals. The transition mechanism completely different from the original dynamical mean field theory (DMFT) emerges from a cluster extension of it. A consistent picture suggests that the quasiparticle weight Z remains nonzero through metals and suddenly jumps to zero at the transition, while the gap opens continuously in the insulators. This is in contrast with the original DMFT, where Z continuously vanishes but the gap opens discontinuously. The present results arising from electron differentiation in momentum space agree with recent puzzling bulk-sensitive experiments on CaVO3 and SrVO3.
@article{arxiv.0706.0444,
title = {Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory},
author = {Y. Z. Zhang and Masatoshi Imada},
journal= {arXiv preprint arXiv:0706.0444},
year = {2007}
}