Influence of the impurity scattering on charge transport in unconventional superconductor junctions
Influence of the impurity scattering on charge transport in unconventional superconductor junctions
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DOI：
10.1103/physrevb.94.014504
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发表时间：
2016-04
影响因子：
3.7
通讯作者：
Bo Lu;P. Burset;Y. Tanuma;A. Golubov;Y. Asano;Yukio Tanaka
中科院分区：
文献类型：
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作者：
Bo Lu;P. Burset;Y. Tanuma;A. Golubov;Y. Asano;Yukio Tanaka
我们通过自洽求解准经典艾伦伯格方程，研究了非磁性杂质散射对由正常金属和无序非常规超导体组成的结的隧道电导的影响。我们发现玻恩极限和酉极限中的杂质散射都会影响安德烈夫束缚态的形成，并强烈改变零偏压附近的隧道光谱。我们的结果可以通过界面附近奇数频率库珀对的出现以及杂质自能的发散行为得到很好的解释。本文提供了一种有用的工具来识别实验中非常规超导体的配对对称性。
We study the influence of nonmagnetic impurity scatterings on the tunneling conductance of a junction consisting of a normal metal and a disordered unconventional superconductor by solving the quasiclassical Eilenberger equation self-consistently. We find that the impurity scatterings in both the Born and the unitary limits affect the formation of the Andreev bound states and modify strongly the tunneling spectra around zero bias. Our results are interpreted well by the appearance of odd-frequency Cooper pairs near the interface and by the divergent behavior of the impurity self-energy. The present paper provides a useful tool to identify the pairing symmetry of unconventional superconductors in experiments.