Entanglement in fermionic systems at a quantum phase transition

We consider recent results on the use of the single-site entanglement measure for identifying and characterizing a quantum phase transition in systems of interacting fermions. We discuss the extension of these results to fermionic models where the single-site entanglement may fail to signal a quantum phase transition, with particular attention given to the one-dimensional extended UV Hubbard model.

PACS: 71.10.Fd Lattice fermion models (Hubbard model, etc.);
PACS: 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZstates, etc.);
PACS: 03.67.Mn Entanglement production, characterization, and manipulation;
PACS: 05.70.Jk Critical point phenomena.

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