Spectrum of Andreev bound states in Josepshon junctions with a ferromagnetic insulator
arXiv:1109.2753 · doi:10.1016/j.jmmm.2012.02.067
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-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).
6 pages, 5 figures, Invited Report on the Moscow International Symposium on Magnetism MISM2011
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- Connection between zero-energy Yu-Shiba-Rusinov states and 0- transitions in magnetic Josephson junctions
- Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers