Effect of weak magnetic field on quantum spin correlation in an s-wave superconductor

Details Effect of weak magnetic field on quantum spin correlation in an s-wave superconductor Effect of weak magnetic field on quantum spin correlation in an s-wave superconductor

2010-11-12

arxiv.org/abs/1011.3011v1

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure

Scientific paper

We study the effect of a weak magnetic field on the state of the spins of a pair of electrons forming a Cooper pair in an s-wave superconductor. By perturbatively solving time-dependent Bogoliubov equations up to first order, we obtain the two-particle Green function, and whence the two-electron spin-space density matrix. It appears that up to first order approximation, the spin state of a Cooper pair retains the form of a Werner state. This state is then examined in the sense of quantum correlations, i.e., quantum discord.

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