• Effect of quantum entanglement on Aharonov-Bohm oscillations, spin-polarized transport and current magnification effect

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/058/02/0173-0181

    • Keywords

       

      Entanglement; Aharonov-Bohm effect; spin-conductance; dephasing; decoherence; current magnification

    • 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.

    • Author Affiliations

       

      AM Jayannavar1

      1. Institute of Physics, Sachivalaya Marg, Bhubaneswar - 751 005, India
    • Dates

       
  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.