Surface density of states of s+-wave Cooper pairs in a two-band model

Details Surface density of states of s+-wave Cooper pairs in a two-band model Surface density of states of s+-wave Cooper pairs in a two-band model

2009-01-09

arxiv.org/abs/0901.1166v2

Phys. Rev. B 79, 174526 (2009)

Physics

Condensed Matter

Superconductivity

7 pages, 10 figures

Scientific paper

We calculate 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 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-Tc cuprates.

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