Surface Bound States in n-band Systems with Quasiclassical Approach

Details Surface Bound States in n-band Systems with Quasiclassical Approach Surface Bound States in n-band Systems with Quasiclassical Approach

2009-03-06

arxiv.org/abs/0903.1227v2

Phys. Rev. B 79, 224508 (2009)

Physics

Condensed Matter

Superconductivity

9 pages, 7 figures; References and Discussions updated

Scientific paper

10.1103/PhysRevB.79.224508

We discuss the tunneling spectroscopy at a surface in multi-band systems such as Fe-based superconductors with the use of the quasiclassical approach. We extend the single-band method by Matsumoto and Shiba [J. Phys. Soc. Jpn. 64, 1703 (1995)] into $n$-band systems ($n \geq 2$). We show that the appearance condition of the zero-bias conductance peak does not depend on details of the pair-potential anisotropy, but it depends on details of the normal state properties in the case of fully-gapped superconductors. The surface density of states in a two-band superconductor is presented as a simplest application. The quasiclassical approach enables us to calculate readily the surface-angular dependence of the tunneling spectroscopy.

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