Volume 110, Number 3, May 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 May 2015|
Andreev spectroscopy of Majorana states in topological superconductors with multipocket Fermi surfaces
1 CFIF and CeFEMA, Instituto Superior Técnico, Universidade de Lisboa - Av. Rovisco Pais, P-1049-001 Lisboa, Portugal
2 Departamento de Física, Universidade de Évora - P-7000-671, Évora, Portugal
3 Beijing Computational Science Research Center - Beijing 100089, China
Received: 3 February 2015
Accepted: 28 April 2015
The topological properties of a multiband topological superconductor in two dimensions are studied, when the latter is obtained by introducing electron pairing in an otherwise topological insulator. The type of pairing, doping and Fermi surface topology play an essential role. Considering the Andreev reflection problem, we use a previously developed quantum waveguide theory for multiorbital systems and find that, when the Fermi surface has several pockets, this theory retrieves the correct number of Majorana fermion states as predicted by the topological index. By varying band structure parameters, the Fermi surface topology of the normal phase can be changed, whereby the number of Majorana modes also varies. We calculate the effect of such transitions on the Andreev differential conductance.
PACS: 73.20.-r – Electron states at surfaces and interfaces / 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EPLA, 2015
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