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

Details Spectrum of Andreev bound states in Josepshon junctions with a ferromagnetic insulator Spectrum of Andreev bound states in Josepshon junctions with a ferromagnetic insulator

2011-09-13

arxiv.org/abs/1109.2753v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures, Invited Report on the Moscow International Symposium on Magnetism MISM2011

Scientific paper

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-pi 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 pi (0) state is always more stable than the 0 (pi) state if L is odd (even).

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