Aharonov-Bohm oscillations and spin-polarized transport in a mesoscopic ring with a magnetic impurity

Joshi, Sandeep K. ; Sahoo, Debendranath ; Jayannavar, A. M. (2001) Aharonov-Bohm oscillations and spin-polarized transport in a mesoscopic ring with a magnetic impurity Physical Review B: Condensed Matter and Materials Physics, 64 (7). 075320_1-075320_6. ISSN 1098-0121

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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.64.075320

Related URL: http://dx.doi.org/10.1103/PhysRevB.64.075320

Abstract

We present a detailed analysis of Aharonov-Bohm (AB) interference oscillations manifested through transmission of an electron in a mesoscopic ring with a magnetic impurity atom inserted in one of its arms. Spin-polarized transport is also studied. The electron interacts with the impurity through exchange interaction, leading to spin-flip scattering. Transmission in the spin-flipped and -unflipped channels are explicitly calculated. We show that entanglement between electron and spin-flipper states leads to reduction of AB oscillations in spite of the absence of any inelastic scattering. The spin conductance (related to spin-polarized transmission coefficient) is asymmetric under flux reversal, as opposed to the two-probe conductance, which is symmetric. We point out certain limitations of this model in regard to the general notion of dephasing in quantum mechanics.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:14358
Deposited On:12 Nov 2010 08:52
Last Modified:16 May 2016 23:21

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