Developed ultra-high resolution scanning microwave impedance microscopy technique and applied it to image superstructure in graphene on h-BN.
Significance and Impact
5nm resolution allows direct observation of electronic structure of moiré lattices and superstructures.
- Created “barb” modified tip for scanning microwave impedance microscopy, yielding new ultra-high-resolution microwave impedance microscopy, uMIM
- Functions under ambient conditions
- Custom moiré such as the Kagome lattice are also created and characterized. Band structure calculations performed using tight-binding model informed from ab initio density functional theory (DFT)
- Pathway to explore flat band physics