Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Transport: Topological Insulators 2 (jointly with HL and MA)
TT 9.4: Vortrag
Montag, 26. März 2012, 15:45–16:00, H 3005
Topologically protected zero-energy surface states of noncentrosymmetric superconductors — •Philip M. R. Brydon1, Andreas P. Schnyder2, and Carsten Timm1 — 1Technische Universität Dresden, Dresden, Germany — 2Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
It has recently been pointed out that nodal noncentrosymmetric superconductors are topologically non-trivial, with the nodal rings possessing a non-zero topological charge [1]. In these systems a bulk-boundary correspondence can be developed, which guarantees the existence of a flat band of singly degenerate zero-energy states within the projection of the nodal lines onto the surface Brillouin zone. Using the quasiclassical method [2,3], we present results for the surface bound state spectra, and provide a condition for the existence of the zero-energy states in terms of the sign of the gaps, which is complementary to the topological condition. The zero-energy surface states are shown to leave distinct signatures in the tunneling conductance.
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A. P. Schnyder, P. M. R. Brydon, and C. Timm, arXiv:1111.1207 (unpublished).