Role of quantum entanglement due to a magnetic impurity on current magnification effect in mesoscopic open rings

Details Role of quantum entanglement due to a magnetic impurity on current magnification effect in mesoscopic open rings Role of quantum entanglement due to a magnetic impurity on current magnification effect in mesoscopic open rings

2000-11-23

arxiv.org/abs/cond-mat/0011402v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages RevTex, 5 figures included

Scientific paper

10.1142/S0217984901001471

We study the current magnification effect in presence of exchange scattering of electron from a magnetic impurity placed in one arm of an open mesoscopic ring. The exchange interaction causes entanglement of electron spin and impurity spin. Earlier studies have shown that such an entanglement causes reduction or loss of interference in the Aharonov-Bohm oscillations leading to decoherence. We find however, that this entanglement, in contradiction to the naive expectation of a reduction of current magnification, leads to enhancement as well as suppression of the effect. We also observe additional novel features like new resonances and current reversals.

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