Monolayer hexagonal boron nitride can extend plasmonic enhancement limit

https://phys.org/news/2023-04-monolayer-hexagonal-boron-nitride-plasmonic.html

"block electron tunneling and extend the ultimate plasmonic enhancement limits in a single-atom-layer gap,... high tunneling barrier formed by monolayer h-BN, actively blocking the electron tunneling effect... detecting intrinsic SERS intensity h-BN single particle cavity... monolayer h-BN blocks electron tunneling using hot electron tunneling quantum computation and layer-dependent scattering spectrum experiments"