Premature Switching in Graphene Josephson Transistors

Details Premature Switching in Graphene Josephson Transistors Premature Switching in Graphene Josephson Transistors

2009-03-04

arxiv.org/abs/0903.0712v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Solid State Communications

Scientific paper

We investigate electronic transport in single layer graphene coupled to superconducting electrodes. In these Josephson transistors, we observe significant suppression in the critical current Ic and large variation in the product IcRn in comparison to theoretic predictions in the ballistic limit. We show that the depression of Ic can be explained by premature switching in underdamped Josephson junctions described within the resistively and capacitively shunted junction (RCSJ) model. By considering the effect of premature switching and dissipation, the calculated gate dependence of product IcRn agrees with experimental data. Our discovery underscores the crucial role of thermal fluctuations in electronic transport in graphene Josephson transistors.

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