Variational description of Mott insulators

Details Variational description of Mott insulators Variational description of Mott insulators

2004-03-17

arxiv.org/abs/cond-mat/0403430v2

Physics

Condensed Matter

Strongly Correlated Electrons

revised version; to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.026406

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 $t-t^\prime$ Hubbard model, where at half filling we reproduce all known phases, namely the ordinary Mott undimerized insulator with power-law spin correlations at small $t^\prime/t$, the spin-gapped metal above a critical $t^\prime/t$ and small $U$, and the dimerized Mott insulator at large repulsion.

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