Bose-Einstein condensation CVD graphene Dirac fermions GB distribution Klein tunneling Physics angle-resolved photoemission augmented plane waves band structure borophene circulating system conductive ink dephasing dipolar exitons electric field electron scattering electronic transport in graphene first-principle grain boundary (GB) grain size graphene graphene nanosheets graphene solution image potential image-plane position image-potential states inkjet printing ion-selective field-effect transistor liquid conductor low-dimensional semimetals