Cluster Dynamical Mean Field analysis of the Mott transition

Details Cluster Dynamical Mean Field analysis of the Mott transition Cluster Dynamical Mean Field analysis of the Mott transition

2003-08-27

arxiv.org/abs/cond-mat/0308577v1

Phys. Rev. Lett. 92, 226402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevLett.92.226402

We investigate the Mott transition using a cluster extension of dynamical mean field theory (DMFT). In the absence of frustration we find no evidence for a finite temperature Mott transition. Instead, in a frustrated model, we observe signatures of a finite temperature Mott critical point in agreement with experimental studies of kappa-organics and with single site DMFT. As the Mott transition is approached, a clear momentum dependence of the electron lifetime develops on the Fermi surface with the formation of cold regions along the diagonal direction of the Brillouin zone. Furthermore the variation of the effective mass is no longer equal to the inverse of the quasi particle residue, as in DMFT, and is reduced approaching the Mott transition.

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