Shape of Cooper pairs in a normal-metal/superconductor junction

被引:8
作者
Tanaka, Yukio [1 ,2 ]
Asano, Yasuhiro [3 ]
Golubov, Alexander A. [4 ,5 ]
机构
[1] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan
[2] Japan Sci & Technol Cooperat, CREST, Nagoya, Aichi 4648603, Japan
[3] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan
[4] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
[5] Univ Twente, Mesa Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
来源
PHYSICAL REVIEW B | 2008年 / 77卷 / 22期
关键词
D O I
10.1103/PhysRevB.77.220504
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In s-wave superconductors the Cooper pair wave function is isotropic in momentum space. This property may also be expected for Cooper pairs entering a normal metal from a superconductor due to the proximity effect. We show, however, that such a deduction is incorrect and the pairing function in a normal metal is surprisingly anisotropic because of quasiparticle interference. We calculate angle-resolved quasiparticle density of states in NS bilayers which reflects such anisotropic shape of the pairing function. We also propose a magnetotunneling spectroscopy experiment which could confirm our predictions.
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页数:4
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