Theory of 铿乶ite temperature Josephson transport through a ferromagnetic insulator

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• 作者：Shuhei Nakamura^a ; Satofumi Souma^a ; Matsuto Ogawa^a ; Shiro Kawabata^b ; ^c ; ^{s-kawabata@aist.go.jp}
• 关键词：Josephson junction ; Ferromagnetic insulator ; Tight binding model ; Spintronics ; Quantum computer
• 刊名：Physics Procedia
• 出版年：2012
• 期刊代码：P128_18753892
• 类别：ph
• 出版时间：2012
• 卷：27
• 期：Complete
• 页码：308-311
• 文件大小：401 K

摘要

We predict an anomalous 0-蟺 transition in Josephson junctions with a ferromagnetic-insulator (FI) barrier. Previously it wasfoundthattheground stateofsuch junctions alternates between0and 蟺 states when the thickness of FI is increasing by a single atomic layer. By solving the Bogoliubov de-Gennes equation and using the Furusaki-Tsukada formula, we show that similar 0-蟺 transition canbe also inducedby increasing temperature T. Therefore the existence of 蟺 state can beexperimentally con铿乺medby simply observing the nonmonotonic T dependence of the Josephson critical current.