Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory

Details Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory

2007-06-04

arxiv.org/abs/0706.0444v1

Phys. Rev. B 76, 045108 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.76.045108

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 CaVO$_3$ and SrVO$_3$.

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