The density-driven Mott transition is studied by means of dynamical mean-field theory in the Hubbard-Holstein model, where the Hubbard term leading to the Mott transition is supplemented by an electron-phonon (e-ph) term. We show that an intermediate e-ph coupling leads to a first-order transition at T=0, which is accompanied by a phase separation between a metal and an insulator. The compressibility in the metallic phase is substantially enhanced. At quite larger values of the coupling, a polaronic phase emerges coexisting with a nonpolaronic metal.
Phase separation close to the density-driven Mott transition in the Hubbard-Holstein model / Capone, C; Sangiovanni, G; Castellani, Claudio; DI CASTRO, Carlo; Grilli, Marco. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 92:(2004), pp. 106401:1-106401:4. [10.1103/PhysRevLett.92.106401]
Phase separation close to the density-driven Mott transition in the Hubbard-Holstein model
CASTELLANI, Claudio;DI CASTRO, Carlo;GRILLI, Marco
2004
Abstract
The density-driven Mott transition is studied by means of dynamical mean-field theory in the Hubbard-Holstein model, where the Hubbard term leading to the Mott transition is supplemented by an electron-phonon (e-ph) term. We show that an intermediate e-ph coupling leads to a first-order transition at T=0, which is accompanied by a phase separation between a metal and an insulator. The compressibility in the metallic phase is substantially enhanced. At quite larger values of the coupling, a polaronic phase emerges coexisting with a nonpolaronic metal.File | Dimensione | Formato | |
---|---|---|---|
CSCDG-PRL04.pdf
solo gestori archivio
Tipologia:
Documento in Post-print (versione successiva alla peer review e accettata per la pubblicazione)
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
107.48 kB
Formato
Adobe PDF
|
107.48 kB | Adobe PDF | Contatta l'autore |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.