Spontaneous currents in a ferromagnet - normal metal - superconductor trilayer
Spontaneous currents in a ferromagnet - normal metal - superconductor trilayer
复制标题
铁磁体 - 普通金属 - 超导体三层中的自发电流
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
B. L. Gyorffy
中科院分区：
文献类型：
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作者：
M. Krawiec;J. Annett;B. L. Gyorffy
在紧束缚Hubbard模型下讨论了由铁磁体和超导体夹着正常金属组成的系统的基态性质。我们求解了自旋极化的Hartree-Fock- Gorkov方程和麦克斯韦方程（安培定律），在该系统中发现了邻近诱导的Fulde-Ferrell-Larkin-Ovchinnikov态。在这里，我们表明，在这些子系统之间包含正常的金属层并不一定会导致富尔德-费雷尔-拉金-奥夫钦尼科夫相的抑制。此外，我们发现，依赖于正常的金属板的厚度，系统可以周期性地在有自发电流流动的状态和没有电流的状态之间切换。所有这些效应都可以用这种结构中形成的Andreev束缚态来解释。
We discuss the ground state properties of the system composed of a normal metal sandwiched between ferromagnet and superconductor within a tight binding Hubbard model. We solved the spin-polarized Hartree–Fock– Gorkov equations together with the Maxwell equation (Ampere’s law) and found a proximity induced Fulde–Ferrell–Larkin–Ovchinnikov state in this system. Here we show that the inclusion of the normal metal layer in between those subsystems does not necessarily lead to the suppression of the Fulde– Ferrell–Larkin−Ovchinnikov phase. Moreover, we found that depending on the thickness of the normal metal slab the system can be switched periodically between the state with the spontaneous current flowing to that one with no current. All these effects can be explained in terms of the Andreev bound states formed in such structures.