Josephson current and multiple Andreev reflections in graphene SNS junctions

By Xu Du, I. Skachko, E. Andrei. 2007

226 citations recorded by the source corpus.

The Josephson effect and superconducting proximity effect were observed in superconductor-graphene-superconductor (SGS) Josephson junctions with coherence lengths comparable to the distance between the superconducting leads. By comparing the measured gate dependence of the proximity induced subgap features (multiple Andreev reflections) and of the supercurrent to theoretical predictions, we find that the diffusive junction model yields close quantitative agreement with the results. By contrast, predictions of the ballistic SGS model are inconsistent with the data. We show that all SGS devices reported so far, our own as well as those of other groups, fall in the diffusive junction category. This is attributed to substrate induced potential fluctuations due to trapped charges and to the invasiveness of the metallic leads.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/14f9d15cf93cad3d4db20e663ca0327f52925652

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. E. Rossi
2. E. Hwang
3. S. Adam
4. A. Mahmood
5. C. Soldano
6. Carmine Granata
7. Antonio Vettoliere
8. E. Dujardin

In Materials Chemistry

1. E. Rossi
2. E. Hwang
3. S. Adam
4. A. Mahmood
5. C. Soldano
6. Carmine Granata
7. Antonio Vettoliere
8. E. Dujardin

Citations in the corpus

• Production, properties and potential of graphene (2010, background): “[167-169] and the observation of Andreev reflections.[161, 170-173] Spin precession over micrometer scale distances has also been demonstrated in single graphene sheets at room temperature.”
• Nano Superconducting Quantum Interference device: a powerful tool for nanoscale investigations (2015, methodology): “” to investigate the innovative material is the SQUID based on graphene junctions [214]. The possibility to realize a Josephson junction based on a graphene barrier was investigated in previous works [215,216]. Such a SQUID can be used as a tool to investigate the CPR of graphene Josephson junctions”
• Electronic transport in two-dimensional graphene (2010, background): “Despite the limited variation in carrier density, suspended graphene has achieved a carrier mobility of more than 200, 000 cm2/Vs (Bolotin et al., 2008a,b; Du et al., 2008b).”