Variational description of Mott insulators.
The Gutzwiller wave function for a strongly correlated model can, if supplemented with a long-range Jastrow factor, provide a proper variational description of Mott insulators, so far unavailable. We demonstrate this concept in the prototypical one-dimensional t-t(') Hubbard model, where at half-filling we reproduce all known phases, namely, the ordinary Mott undimerized insulator with power-law spin correlations at small t(')/t, the spin-gapped metal above a critical t(')/t and small U, and the dimerized Mott insulator at large repulsion.
Capello
Manuela
M
International School for Advanced Studies (SISSA), Via Beirut 2-4, I-34014 Trieste, Italy.
Becca
Federico
F
Fabrizio
Michele
M
Sorella
Sandro
S
Tosatti
Erio
E