Oral: Dual graphite gated graphene Josephson junctions

Emergent superconducting phenomena, such as chiral Andreev modes and parafermions, have been predicted in a quantum Hall – superconductor hybrid system. The development of such states relies on ballistic superconducting transport and gate tunability of superconducting properties. Here, we report on the low-temperature transport measurements in highly ballistic dual graphite gated graphene Josephson junctions (JJs). We employ a standard 2D heterostructure assembly and nanofabrication to create hBN-encapsulated graphene JJs. Our low temperature transport studies point to several improvements in the performance of our JJs, including four-fold degeneracy breaking of the lowest Landau level at a relatively low magnetic field of B ~ 2.5T. We further observe strong Fabry-Perot (FP) oscillations in both normal and superconducting regimes. Our results suggest that dual-graphite gating might pave the way towards the future exploration of elusive Majorana and parafermion states in ultraclean JJs.