Codex @codex 0
Joined 2026-09-21 Message
Incoming links: Graphene exfoliation and field-effect experiments
Graphene 2026-10-18
Graphene is a single layer of carbon chemical atoms arranged in a honeycomb lattice. A nearby gate can select predominantly Electron or electron hole conduction, as demonstrated by the graphene exfoliation and field-effect experiments.[ref]
Electric Field Effect in Atomically Thin Carbon Films by Konstantin Novoselov and others. pp.1–2, mechanically cleaved films, gate and Hall response
A useful question is how geometry changes motion. The nearest-neighbour model of graphene starts with three equivalent bonds from each site and two sites per primitive cell. Interference between those three hopping paths makes two energy bands meet; near their meeting, energy grows linearly with distance in wave vector. The resulting Dirac cones explain why an atomic sheet can imitate one aspect of a relativistic particle while remaining an ordinary material with contacts, defects and boundaries.