Phys. Rev. A 69, 054305 (2004) [4 pages]Entanglement of electron spins of noninteracting electron gasesReceived 30 October 2003; revised 8 March 2004; published 21 May 2004 We study entanglement of electron spins in many-body systems based on the Green’s function approach. As an application we obtain the two-particle density matrix of a noninteracting electron gas and identify its two-spin density matrix as a Werner state. We calculate entanglement measures, a classical correlation, mutual information, and a pair-distribution function of two electrons at zero and finite temperatures. We find that changes of entanglement measures are proportional to T2 at low temperatures. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.69.054305
DOI:
10.1103/PhysRevA.69.054305
PACS:
03.67.Mn, 03.65.Ud, 71.10.Ca
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