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MA: Fachverband Magnetismus
MA 41: Topological Insulators 4 (jointly with DS, HL, MA, and O)
MA 41.9: Talk
Thursday, March 14, 2013, 17:30–17:45, H18
Robustness of edge states in non-centrosymmetric superconductors — •Raquel Queiroz und Andreas P. Schnyder — Max Planck Institut für Festörperforschung, 70569 Stuttgart, Germany
Nodal superconductors without inversion symmetry have non-trivial topological properties, manifested by
topologically protected flat-band edge states [1-3]. Since the bulk is not fully gapped, the edge states of nodal superconductors can in principle be susceptible to impurities, which break translational symmetries.
Using recursive Green’s function techniques we study
the robustness of these edge states against both magnetic and non-magnetic disorder.
We show that for weak and dilute non-magnetic impurities, a finite number of mid-gap edge states remains at zero-energy.
We compute the zero bias conductance of a junction between a normal lead and a non-centrosymmetric superconductor as a function of disorder strength.
It is found that the flat-band edge states give rise to a nearly quantized zero-bias conductance even in the presence of non-magnetic impurities.
[1] A. P. Schnyder and S. Ryu, Phys. Rev. B 84, 060504(R) (2011)
P. M. R. Brydon, A. P. Schnyder, and C. Timm, Phys. Rev. B 84, 020501(R) (2011)
A. P. Schnyder, P. M. R. Brydon, and C. Timm, Phys. Rev. B 85, 024522 (2012)