Ab Initio Study on Graphene Edge/Super Conductor Contact Interfaces
Abstract
The aim of proposed study is to investigate intriguing physics emerging at graphene edge/superconductor (SC) contact configuration. Different from side contact through vdW gap, that is, vertical stacking of graphene and SC, the edge contact configuration is reported to show lower contact resistance and ballistic transport at low temperature. Moreover, relatively larger orbital overlap at the interface can increase transmission. On the other hand, superconducting proximity effect has been observed at graphene/SC interface in the side contact configuration, in which an atomically clean interface without surface states in superconducting gap provides opportunities to observe novel phenomena arising from the coupling of graphene and highly interacting system. It is much more challenging to study graphene edge/SC interface since chemical bonding and atomic bond length change at the interface can greatly affect the intrinsic electronic structure. Therefore, a thorough theoretical investigation using density functional theory method on graphene edge/SC interface is crucial for choosing appropriate interface structure to observe superconducting proximity effect as demonstrated in the side contact configuration. In this short project, we will investigate graphene edge/bcc-Mo contact configuration as a first step to further study on graphene edge contact with superconducting MoRe alloy and binary compound NbN. The structural complexity of these alloy and compound materials requires significant modeling efforts for a systematic study on the atomic and electronic structure changes at graphene/SC interface. Thus, we prioritize a focus on model interface of graphene edge/Mo and develop a systematic approach that is equally applicable for the future study on MoRe and NbN for a future study.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 16, 2018
- Source ID
- W911NF1710369
Entities
People
- Kyeongjae Cho
Organizations
- Army Contracting Command
- United States Army
- University of Texas at Dallas