Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.18: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Robustness of surface states in noncentrosymmetric superconductors — •Raquel Queiroz and Andreas Schnyder — Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

Noncentrosymmetric superconductors, where spin singlet and triplet pairing states are mixed, exhibit topologically protected zero-energy flat bands localized on the surface [1-3]. The region of the surface Brillouin zone where these states appear is bounded by the projections of the nodal lines of the bulk gap. Using both analytical analysis and numerical simulations, we study the robustness of these surface states against surface roughness and disorder. We show that time-reversal preserving disorder leaves the surface states mostly unaffected. Time-reversal breaking perturbations, on the other hand, such as magnetic impurities, result in a shift of the surface states away from zero energy, but do not change the total amount of ingap states.
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A. P. Schnyder, P. M. R. Brydon, and C. Timm, arXiv/1111.1207 (unpublished).