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Surface density of states of s+-wave Cooper pairs in a two-band model
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.Comment: 7 pages, 10 figure
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