Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.46: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU D

Local density of states at faceted boundaries of d-wave superconductors — •Christian Iniotakis, Siegfried Graser, Thomas Dahm, and Nils Schopohl — Universität Tübingen, Lehrstuhl für Theoretische Festkörperphysik, Auf der Morgenstelle 14, 72076 Tübingen, Germany

The local density of states at the boundary of a superconductor is a crucial factor in many experiments, for example tunneling measurements. For conventional s-wave superconductors, the local density of states at the boundary is practically the same as in the bulk. In particular, the specific boundary geometry is irrelevant. In the case of d-wave symmetry, however, the situation is completely different. Apart from the well-known formation of Andreev bound states at the surface, it is important to realize that for d-wave symmetry also the boundary geometry itself can have strong influence on the local density of states. In this work, we examine the local density of states at the surface of a d-wave superconductor for some basic examples of polygonal and faceted boundary geometries. We also consider the additional influence of a single Abrikosov vortex pinned near the boundary geometry.