Positive cross-correlations induced by ferromagnetic contacts

Details Positive cross-correlations induced by ferromagnetic contacts Positive cross-correlations induced by ferromagnetic contacts

2001-11-29

arxiv.org/abs/cond-mat/0111564v2

Phys. Rev. B 65, 134522 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures; accepted version by PRB, figures replaced

Scientific paper

10.1103/PhysRevB.65.134522

Due to the Fermionic nature of carriers, correlations between electric currents flowing through two different contacts attached to a conductor present a negative sign. Possibility for positive cross-correlations has been demonstrated in hybrid normal/superconductor structures under certain conditions. In this paper we show that positive cross-correlations can be induced, if not already present, in such structures by employing ferromagnetic leads with magnetizations aligned anti-parallel to each other. We consider three-terminal hybrid structures and calculate the mean-square correlations of current fluctuations as a function of the bias voltage at finite temperature.

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