Barbaros Ozyilmaz

Abstract Efficient and reliable spin injection at room temperature with scalability is crucial for spintronic applications but remains challenging. Direct ferromagnetic metal deposition on two-dimensional materials often leads to inefficient transparent contacts. Here, we introduce an indium buffer layer between ferromagnetic cobalt (Co) and graphene to establish high-efficiency van der Waals (vdW) tunnel contacts.

Abstract Plasmonic tunnel junctions are a unique electroluminescent system in which light emission occurs via an interplay between tunnelling electrons and plasmonic fields instead of electron–hole recombination as in conventional light-emitting diodes. It was previously shown that placing luminescent molecules in the tunneling pathway of nanoscopic tunnel junctions results in peculiar upconversion electroluminescence where the energy of emitted photons exceeds that of excitation electrons.