Spectrum of Andreev bound states in Josephson junctions with a ferromagnetic insulator

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Kawabata, S. and Tanaka, Y. and Golubov, A. and Vasenko, A. and Asano, Y. (2012) Spectrum of Andreev bound states in Josephson junctions with a ferromagnetic insulator. Journal of magnetism and magnetic materials, 324 . 3467 - 3470. ISSN 0304-8853

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Abstract:Ferromagnetic-insulator (FI) based Josephson junctions are promising candidates for a coherent superconducting quantum bit as well as a classical superconducting logic circuit. Recently the appearance of an intriguing atomic-scale 0–π transition has been theoretically predicted. In order to uncover the mechanism of this phenomena, we numerically calculate the spectrum of Andreev bound states in a FI barrier by diagonalizing the Bogoliubov–de Gennes equation. We show that Andreev spectrum drastically depends on the parity of the FI-layer number L and accordingly the π(0) state is always more stable than the 0 (π) state if L is odd (even).
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/82262
Official URL:http://dx.doi.org/10.1016/j.jmmm.2012.02.067
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Metis ID: 289252