Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1

TT 6.10: Vortrag

Montag, 26. März 2012, 12:00–12:15, BH 334

Highly efficient Cooper pair splitting with carbon nanotube quantum dots — •Jens Schindele, Andreas Baumgartner, and Christian Schönenberger — Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

An elegant idea for the creation of entangled electrons in a solid-state device is to split spin-singlet Cooper pairs by coupling a superconductor to two parallel quantum dots (QDs) in a Y-junction geometry [1]. Such Cooper pair splitting (CPS) was successfully detected in recent transport experiments on devices based on InAs nanowires [2,3] and Carbon nanotubes (CNTs) [4].

Here we present experiments on a CNT based Cooper pair splitter device with low inter-dot tunnel coupling. We find an unprecedented splitting efficiency, often much larger than 50

A high CPS efficiency is a prerequisite for Bell state measurements, a clear way of proving that Cooper pairs can be extracted coherently and lead to spatially separated entangled electron pairs.
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