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Sign Reversal of AC Josephson Current in a Ferromagnetic Josephson Junction

机译:铁磁约瑟夫逊结中交流约瑟夫逊电流的符号反转

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摘要

The ac Josephson effect in a ferromagnetic Josephson junction, which is composed of two superconductors separated by a ferromagnetic metal (FM), is Studied by a tunneling Hamiltonian and Green's function method. We obtain two types of superconducting phase dependent currents, i.e., Josephson current and quasiparticle-pair-interference current (QPIC). These currents change their signs with thickness of the FM layer due to the 0-pi transition characteristic to the ferromagnetic Josephson junction. As a function of applied voltage, the Josephson critical current shows a logarithmic divergence called the Riedel peak at the gap voltage, while the QPIC shows a discontinuous jump. The Riedel peak reverses due to the 0-pi transition and disappears near the 0-pi transition point. The discontinuous jump in the QPIC also represents similar behaviors to the Riedel peak. These results are in contrast to the conventional ones.
机译:通过隧穿哈密顿量和格林函数方法研究了铁磁约瑟夫逊结中的交流约瑟夫森效应,该结由两个被铁磁金属(FM)隔开的超导体组成。我们获得两种类型的超导相变电流,即约瑟夫森电流和准粒子对干扰电流(QPIC)。由于铁磁约瑟夫逊结的0-pi过渡特性,这些电流随FM层的厚度改变其符号。作为施加电压的函数,约瑟夫森临界电流在对隙电压处显示出对数发散,称为里德尔峰,而QPIC则显示出不连续的跃迁。 Riedel峰由于0-pi跃迁而反转,并在0-pi跃迁点附近消失。 QPIC中的不连续跳变也表现出与Riedel峰相似的行为。这些结果与常规结果相反。

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