Low Temperature Physics: 33, 935 (2007); https://doi.org/10.1063/1.2747069 (9 pages)
Физика Низких Температур: Том 33, Выпуск 11 (Ноябрь 2007), c. 1232-1242    ( к оглавлению , назад )

Entanglement in fermionic systems at a quantum phase transition

Henrik Johannesson1 and Daniel Larsson2

1 Department of Physics, Göteborg University, Göteborg SE-412 96, Sweden
E-mail: johannesson@physics.gu.se

2 School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom

Received April 16, 2007


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.

Key words: fermionic models, quantum phase transition, Hubbard model.