Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 98: Topological insulators (TT, jointly with DS, HL, MA, O)
HL 98.3: Vortrag
Freitag, 15. März 2013, 10:00–10:15, H18
All-electrical measurement of crossed Andreev reflection in topological insulators — •Rolf W. Reinthaler1, Patrik Recher2, and Ewelina M. Hankiewicz1 — 1Faculty of Physics and Astrophysics, University of Würzburg, Würzburg, Germany — 2Institute for Mathematical Physics, Technical University Braunschweig, Braunschweig, Germany
Using a generalized wave matching method we solve the full scattering problem for quantum spin Hall insulator (QSHI) - superconductor (SC) - QSHI junctions. We find that for systems narrow enough so that the bulk states in the SC part couple both edges, the crossed Andreev reflection (CAR) is significant and the electron cotunneling (T) and CAR become spatially separated. We study the effectiveness of this separation as a function of the system geometry and the level of doping in the SC. Moreover, we show that the spatial separation of both effects allows for an all-electrical measurement of CAR and T separately in a 5-terminal setup or by using the spin selection of the quantum spin Hall effect in an H-bar structure [1].
We acknowledge financial support by the DFG grant HA 5893/3-1.
[1] R. W. Reinthaler, P. Recher, and E. M. Hankiewicz, arXiv:1209.5700 (2012)