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Title: Effect of Majorana Fermions on Andreev Spectroscopy of Multiband Topological Superconductors
Authors: Silva, Ana
Araújo, Miguel
Sacramento, Pedro
Keywords: superconcudtivity
Chern number
Andreev reflection
Issue Date: 2015
Publisher: Acta Physica Polonica A, Proceedings of the 11 International School on Theoretical Physics Symmetry and Structural Properties of Condensed Matter, Rzeszów 2014
Citation: Acta Physica Polonica 128, 210 (2015)
Abstract: We introduce a model for a multiband topological superconductor with two orbitals per lattice site, in two spatial dimensions. Concentrating on the Andreev refection problem, the appropriate wave function matching conditions for an interface with a normal single-band metal were previously derived in the framework of a quantum waveguide theory. This theory retrieves the correct number of Majorana fermion states as predicted by the topological index. We obtain the diferential conductance as a function of bias voltage, which displays the contribution of the Majorana fermions. Interface disorder is also considered. By varying band structure parameters, topological transitions can be induced, whereby the number of the Majorana modes varies. We calculate the e ect of such transitions on the diferential conductance.
Type: article
Appears in Collections:FIS - Artigos em Livros de Actas/Proceedings

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