“Features of ballistic superconducting graphene”

Dr. Ivan Borzenets
Physics Department, City University of Hong Kong

Jul. 31 (Wed.), 04:00 PM
E6-2. 1st fl. #1323

Abstract:
Achieving superconducting contacts to ultra-clean graphene results in ballistic Josephson junctions. Such devices have opened up several possibilities in realizing novel topological states and has proposed applications in Quantum Information. Namely, under high magnetic fields, combining several superconducting edge states can result in formation of Parafermions. Here, however, we follow up on the initial works of characterizing ballistic graphene Josephson junctions. Under low magnetic fields we observe a period doubling of magnetic interference patterns, reminiscent of topological states. The source of such features is likely intrinsic to the properties of graphene. In addition we move beyond two-terminal geometry and look at the complex current flow in multi-terminal Josephson junctions, where we observe a coexistence of both normal and super-currents.