Multi-terminal superconductor/graphene nano-devices: From fundamental understanding of the microscopic transport processes towards new macroscopic quantum devices.
The aim of this project is to perform a pioneering experimental investigation of electronic transport in nano-devices containing multiple superconductor (S)/ graphene (G) interfaces. This, in order to gain fundamental understanding of, and control over, the different competing microscopic transport processes through the present interfaces.
The central focus will be on microscopic transport processes in these multi-terminal devices that can create macroscopic quantum coherence, in particular: The Josephson effect and Crossed Andreev Reflections.
The obtained knowledge will be used (i) to realize new nano-devices based having unique functionalities due to macroscopic quantum coherence and (ii) to open up new avenues in quantum information technology.
Although both transport channels have been studied since the 60’s in all-metallic structures, still many fundamental questions remain. The unique properties of graphene allows to study both processes at an unprecedented level. For example, the carrier density, which can be tuned in graphene by the electric field effect, provides new possibilities to control the different transport mechanisms. Moreover, graphene has a weakly interacting solid state environment, allowing to detect more easily signatures of quantum coherence. Last but not least, the unique band-structure of graphene gives rise to novel transport properties that are strikingly different from their allmetallic counterparts.