Effect of quantum entanglement on Aharonov-Bohm oscillations, spin-polarized transport and current magnification effect |
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Authors: | AM Jayannavar |
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Institution: | (1) Institute of Physics, Sachivalaya Marg, 751 005 Bhubaneswar, India |
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Abstract: | We present a simple model of transmission across a metallic mesoscopic ring. In one of its arm an electron interacts with
a single magnetic impurity via an exchange coupling. We show that entanglement between electron and spin impurity states leads
to reduction of Aharonov-Bohm oscillations in the transmission coefficient. The spin-conductance is asymmetric in the flux
reversal as opposed to the two-probe electrical conductance which is symmetric. In the same model, in contradiction to the
naive expectation of a current magnification effect, we observe enhancement as well as suppression of this effect depending
on the system parameters. The limitations of this model to the general notion of dephasing or decoherence in quantum systems
are pointed out. |
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Keywords: | Entanglement Aharonov-Bohm effect spin-conductance dephasing decoherence current magnification |
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