Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory

Abstract

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${}_3$.

5 pages, 4 figures

References in corpus (2)

• Variational cluster approach to correlated electron systems in low dimensions
• Cellular Dynamical Mean Field Theory for the 1D Extended Hubbard Model

Cited by in corpus (4)

• Sum-rules and bath-parametrization for quantum cluster theories
• Local Order and the gapped phase of the Hubbard model: a plaquette dynamical mean field investigation
• Variational Monte Carlo Study of Electron Differentiation around Mott Transition
• Metal-insulator transition in half-filling two-orbital Hubbard model on triangular lattice