Publication : t03/123
Cluster Dynamical Mean Field analysis of the Mott transition
Parcollet O. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)Biroli G. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Kotliar G. (Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA)
Abstract:Année de publication : 2004
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.
Revue : Phys. Rev. Lett. 92 226402 (2004)
DOI : 10.1103/PhysRevLett.92.226402
Preprint : arXiv:cond-mat/0308577
Lien : http://link.aps.org/abstract/PRL/v92/p226402
PACS : 71.10.-w, 71.30.+h
Langue : Anglais
Fichier(s) à télécharger :
publi.pdf
