EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

We have recently shown that proximity with a high-temperature superconductor induces unconventional superconducting correlations in graphene[1]. We will here talk about recent experiments demonstrating [2] that those correlations propagate hundreds of nanometers, allowing for the unique observation of d-wave Andreev-pair interferences in YBCO-graphene devices that behave as a Fabry-Perot cavity. The interferences show as a series of pronounced conductance oscillations. We are able to separate from these conductance oscillations the part stemming from the superconducting normal interface and the part stemming from Fabry Perot like oscillations. The present demonstration is pivotal to the study of exotic directional effects expected for nodal superconductivity in Dirac materials.

[1] Perconte, D., Cuellar, F. A., et. al. (2018). Tunable Klein-like tunnelling of high-temperature superconducting pairs into graphene. Nature Physics, 14(1), 25-29.
[2] Perconte, D. and Seurre, K. et. Al. (2020). Long-Range Propagation and Interference of d-Wave Superconducting Pairs in Graphene. Physical Review Letters 125 (08). 087002