Low Temperature Physics: 33, 935 (2007); https://doi.org/10.1063/1.2747069 (9 pages)
Fizika Nizkikh Temperatur: Volume 33, Number 11 (November 2007), p. 1232-1242    ( to contents , go back )

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
pos Анотація:

Received April 16, 2007

Abstract

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.

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