Conductance quantization and Andreev reflection in narrow ferromagnet/superconductor point contacts
Conductance quantization and Andreev reflection in narrow ferromagnet/superconductor point contacts
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窄铁磁体/超导体点接触中的电导量子化和安德烈夫反射
DOI：
10.1103/physrevb.65.020508
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发表时间：
2001
影响因子：
3.7
通讯作者：
S. Maekawa
中科院分区：
文献类型：
--
作者：
K. Kikuchi;H. Imamura;S. Takahashi;S. Maekawa
从理论上研究了窄铁磁/超导点接触的电导量子化和Andreev反射。我们表明，电导量子化和Andreev反射依赖于是否接触区域是超导或铁磁以及在铁磁体的交换场的强度。铁磁接触的Andreev反射比超导接触的Andreev反射更受抑制。我们还表明，电导-电压曲线有一个凸点在零偏压，如果没有界面散射。相反，当体系存在界面散射时，电导-电压曲线出现下降。
The conductance quantization and Andreev reflection of narrow ferromagnet/superconductor point contacts are theoretically studied. We show that the conductance quantization and the Andreev reflection depend on whether the contact region is superconducting or ferromagnetic as well as on the strength of the exchange field in the ferromagnet. The Andreev reflection of the ferromagnetic contact is more suppressed than that of the superconducting contact. We also show that the conductance-voltage curve has a bump at zero bias voltage if there is no interfacial scattering. On the contrary, the conductance-voltage curve shows a dip if the system has an interfacial scattering.