Variational Description of Mott Insulators
Manuela CapelloInternational School for Advanced Studies (SISSA), Via Beirut 2-4, I-34014 Trieste, ItalyFederico BeccaINFM-Democritos National Simulation Centre, Trieste, ItalyMichele FabrizioINFM-Democritos National Simulation Centre, Trieste, ItalySandro SorellaINFM-Democritos National Simulation Centre, Trieste, ItalyErio TosattiINFM-Democritos National Simulation Centre, Trieste, Italy
2005en
ABI
Abstract
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.
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