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Title: Theory of Andreev reflection in a two-orbital model of iron-pnictide superconductors
Authors: Araújo, Miguel
Sacramento, Pedro
Keywords: supercondutividade
reflexão de Andreev
pnictídeos de ferro
Issue Date: 2010
Publisher: Journal of Physics: Conference Series
Citation: Journal of Physics: Conference Series 200 (2010) 012008
Abstract: A recently developed theory for the problem of Andreev reflection between a normal metal (N) and a multiband superconductor (MBS) assumes that the incident wave from the normal metal is coherently transmitted through several bands inside the superconductor. Such splitting of the probability amplitude into several channels is the analogue of a quantum waveguide. Thus, the appropriate matching conditions for the wave function at the N/MBS interface are derived from an extension of quantum waveguide theory. Interference effects between the transmitted waves inside the superconductor manifest themselves in the conductance. We provide results for a FeAs superconductor, in the framework of a recently proposed effective two-band model and two recently proposed gap symmetries: in the signreversed s-wave ( cos(k x) cos(ky)) scenario resonant transmission through surface Andreev bound states (ABS) at non-zero energy is found as well as destructive interference effects that produce zeros in the conductance; in the extended s-wave ( [cos(k x) + cos(ky)]) scenario no ABS at finite energy are found.
Type: article
Appears in Collections:FIS - Artigos em Livros de Actas/Proceedings

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