Graphene-Superconductor hybrid quantum devices

Details : Graphene is a monatomic layer of carbon atoms arranged on a honeycomb lattice. Since its discovery in 2004, graphene with Dirac-fermionic band structure has provided an ideal and versatile platform to study the interplay between relativistic Dirac fermions and superconductivity [1]. In clear contrast to the case of normal metals, electrostatic gate tunability in graphene with atomic thickness allows unique control over the carrier density and type. Proximity coupling of a superconducting electrode to graphene induces a unique coherent superconducting order in the graphene layer near the interface, which is often the result of the various special normal-state physical characteristics of graphene.


Fig. 1 | Schematics of p/n-Graphene Josephson junction


Fig. 2| Vertical grpahene Josephson junction

My Interests :

  1. Realization of perfect Cooper pair splitter based on graphene
  2. Studying Multi-terminal Josephson junction to realize topological Weyl point
  3. Developing microwave/Near-IR single photon detector (collaboration with Raytheon BBN in US) [2]

[1] Gil-Ho Lee et al.Rep. Prog. Phys (Invited Review); Nat. Comm. 6, 6181 (2015); Nat. Comm. 4, 2525 (2013); Appl. Phys. Express 6, 025102 (2013); Phys. Rev. Lett. 107, 146605 (2011)
[2] Gil-Ho Lee et al., Microwave single photon detector, in preparation (2017)