Probing the helical edge states of a topological insulator by Cooper-pair injection
arXiv:1006.0215 · doi:10.1103/PhysRevB.82.081303
Abstract
We consider the proximity effect between a singlet s-wave superconductor and the edge of a Quantum Spin Hall (QSH) topological insulator. We establish that Andreev reflection at a QSH edge state/superconductor interface is perfect while nonlocal Andreev processes through the superconductor are totally suppressed. We compute the corresponding conductance and noise.
5 pages, 4 figures