Graphene has attracted large attention after single layers of graphite were isolated for the first time by Andrei Geim (Nobelprize 2010). Although graphite is a known two-dimensional layered material, the electronic structure is close to a semi metal with the valence and conduction bands touching at the Fermi level leading to a very small density of states at the Fermi level. However for a single layer of graphite, graphene, two bands with unequal symmetry cross at the Fermi level giving rise to Dirac cones (linear dispersion of electron states near the Fermi level). This property predicts an extreme high mobility of the charge carriers and is therefore of huge interest in the semiconductor technology. In twisted bilayer graphene a superimposed super structure is created depending on the twist angle. With the tuning of the twist angle the superimposed periodicity can be controlled and there with properties the influence the electronic behavior from insulators to superconductors.
Alternative(s): 2D electron systems, Dirac Cones, Hexagonal BN and Black Phosphorus
application-products
LT STM Lab, ARPES Lab, POLAR SPM Lab, DFS30 and DA30-L
