Unconventional metal-insulator transition in two dimensions

Details Unconventional metal-insulator transition in two dimensions Unconventional metal-insulator transition in two dimensions

2005-09-02

arxiv.org/abs/cond-mat/0509062v2

Physics

Condensed Matter

Strongly Correlated Electrons

Reviewed and enlarged version, 6 pages, 7 figures

Scientific paper

10.1103/PhysRevB.73.245116

We show, by using a correlated Jastrow wave function and a mapping onto a classical model, that the two-dimensional Mott transition in a simple half-filled one-band model can be unconventional and very similar to the binding-unbinding Kosterlitz-Thouless transition of vortices and anti-vortices, here identified by empty and doubly occupied sites. Within this framework, electrons strongly interact with collective plasmon excitations that induce anomalous critical properties on both sides of the transition. In particular, the insulating phase is characterized by a singular power law behavior in the photoemission spectrum, that can be continuously connected to the fully-projected insulating state, relevant to strongly correlated low-energy models.

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