Theory of tunnelling into a multi-band superconductor: decoherence and interference

Details Theory of tunnelling into a multi-band superconductor: decoherence and interference Theory of tunnelling into a multi-band superconductor: decoherence and interference

2009-01-11

arxiv.org/abs/0901.1419v2

Physics

Condensed Matter

Superconductivity

4 pages 3 figs, polished version, typo removed, citation fixed

Scientific paper

By an exact formulation of tunnelling into a multi-band superconductor in terms of Green's functions, we demonstrate that the multi-band feature of the iron-based superconductors can lead to novel interference between Andreev reflections and decoherence effect of quasi-particles to Andreev reflections in a tunnelling junction. These effects depend on the relative sign of the gaps for s-wave pairing, and the sign of the Fermi velocities also matters for tunnelling along the nodal direction of d-wave gaps. Experimental probe of such effects could determine both the pairing symmetry and the relative sign of the gaps on different bands.

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