We investigate the Josephson transport through ferromagnetic insulators (FIs) by taking into account the band structure of FIs explicitly. Using the recursive Green's function method, we found the formation of a pi-junction in such systems. Moreover the atomic-scale 0-pi oscillation is induced by increasing the thickness of FI and its oscillation period is universal, i.e., just single atomic layer. Based on these results, we show that stable pi-state can be realized in junctions based on high-Tc superconductors with La2BaCuO5 barrier. Such FI-based Josephson junctions may become an element in the architecture of future quantum computers.
@article{arxiv.1009.5451,
title = {Theory of quantum transport in Josephson junctions with a ferromagnetic insulator},
author = {Shiro Kawabata and Yasuhiro Asano},
journal= {arXiv preprint arXiv:1009.5451},
year = {2013}
}
Comments
6 pages, 5 figures, an invited paper in Low. Temp. Phys., special topics issue on "Quantum coherent effects in superconductors and normal metals"