Graphene

Seeing topological charge by naked eyes

We show that the 2.3% opacity of graphene is independent of frequency and polarization of the light is due to the topological charge of the Dirac points.

Vacancy engineering on graphene

Periodic vacancies can change the crystalline symmetry of graphene and dramatically change its electronic band structure, such as producing a nodal line semimetal enforced by nonsymmorphic symmetry, and inducing phonon-mediated superconductivity due to zero energy flat bands.