Theory of quantum transport in Josephson junctions with a ferromagnetic insulator

Физика Низких Температур: Том 36, Выпуск 10-11 (Октябрь 2010), c. 1143-1148 ( к оглавлению , назад )

Theory of quantum transport in Josephson junctions with a ferromagnetic insulator

Shiro Kawabata

Nanosystem Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
E-mail: s-kawabata@aist.go.jp

CREST, Japan Science and Technology Corporation (JST), Kawaguchi, Saitama 332-0012, Japan

Yasuhiro Asano

Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan

Received April 5, 2010

Abstract

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 π-junction in such systems. Moreover the atomic-scale 0–π 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 π-state can be realized in junctions based on high-T_c superconductors with La₂BaCuO₅ barrier. Such FI-based Josephson junctions may become an element in the architecture of future quantum computers.

PACS: 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects;
PACS: 72.25.–b Spin polarized transport;
PACS: 85.75.–d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integratedmagnetic fields;
PACS: 03.67.Lx Quantum computation architectures and implementations.

Key words: ferromagnetic insulator, Josephson junction, superconductor.

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