Dephasing of Aharonov-Bohm oscillations in a mesoscopic ring with a magnetic impurity

Details Dephasing of Aharonov-Bohm oscillations in a mesoscopic ring with a magnetic impurity Dephasing of Aharonov-Bohm oscillations in a mesoscopic ring with a magnetic impurity

2000-07-26

arxiv.org/abs/cond-mat/0007414v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages RevTex, 6 figures, brief report

Scientific paper

We present a detailed analysis of the Aharonov-Bohm interference oscillations manifested through transmission of an electron in a mesoscopic ring with a magnetic impurity atom inserted in one of its arms. The electron interacts with the impurity through the exchange interaction leading to exchange spin-flip scattering. Transmission in the spin-flipped and spin-unflipped channels are explicitly calculated. We show that the spin-flipper acts as a dephasor in spite of absence of any inelastic scattering. The spin-conductance (related to spin-polarized transmission coefficient) is asymmetric in the flux reversal as opposed to the two probe conductance which is symmetric under flux reversal.

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