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Surface density of states of s_±-wave Cooper pairs in a two-band superconductor model

机译:两波段超导体模型中s_±波Cooper对的状态的表面密度

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摘要

We calculate the surface density of state (SDOS) of s_±-wave Cooper pair in two-band superconductor model, where gap functions have different signs between two bands. We find that the Andreev bound state appears at surface due to the sign change in the gap function in the interband quasiparticle scattering. However, we do not obtain the zero-energy peak of SDOS in contrast to the d-wave case. The tunneling spectroscopy of s_± wave is much more complex as compared to the d-wave case realized in high-T_c cuprates.
机译:我们在两带超导体模型中计算了s_±波Cooper对的表面状态密度(SDOS),其中间隙函数在两个带之间具有不同的符号。我们发现,由于带间准粒子散射中间隙函数的符号变化,Andreev束缚态出现在表面。但是,与d波相比,我们没有获得SDOS的零能峰。与在高T_c铜酸盐中实现的d波情况相比,s_±波的隧道光谱要复杂得多。

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