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Transport Properties of Topological Insulator-Based Ferromagnet/f-Wave Superconductor Junction

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Abstract

We investigate effect of magnetically-induced relativistic mass and also anisotropic f-wave pair coupling on the tunneling conductance on the surface of a 3D topological insulator ferromagnet/superconductor junction, which two types of pairing for superconductivity are possible. A topological insulator as a new state of condensed-matter caused by spin–orbit interaction and time-reversal symmetry has a bulk band gap and gapless surface states. We use the BTK formalism to find the charge carriers behavior. Due to two different nature of order parameters of the f-wave superconductivity, the tunneling conductance is found to be linearly dependent on the magnetic gap in terms of f 1 and the exponential for f 2. It is shown that the conversion of the conductance peak from ZBCP to ZBCD occurs in the f 1 case with increasing m, while this is not observed in f 2. Also, we find that the conductance behaves as a unit step function for the superconductor electrostatic potential in f 1, and this should be usable in nanoelectronic switch devices. In addition, we illustrate how the magnetic gap affects the transmission coefficient in quite different behaviors for order parameters.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Urmia University, Urmia, P.O. Box 165, Iran

    H. Goudarzi & M. Khezerlou

  2. Department of Physics, Islamic Azad University of Urmia, Urmia, Iran

    J. Alilou

Authors
  1. H. Goudarzi
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  2. M. Khezerlou
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  3. J. Alilou
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Correspondence to H. Goudarzi.

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Goudarzi, H., Khezerlou, M. & Alilou, J. Transport Properties of Topological Insulator-Based Ferromagnet/f-Wave Superconductor Junction. J Supercond Nov Magn 26, 3355–3362 (2013). https://doi.org/10.1007/s10948-013-2198-0

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  • DOI: https://doi.org/10.1007/s10948-013-2198-0

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