Landau Diamagnetism in Graphene

On the basis of the $\pi $ electrons, which are free to move from carbon atom to adjacent carbon atom under the influence of impressed fields, graphene suspected has a properties of Landau diamagnetism discovered in 1930. Starting from colloidal graphene, we report an experiment of alignment of large quantity monolayer and few-layer graphene in a solution by magnetic field, due to the significant high diamagnetism and the anisotropy in graphene. By this method, an novel material in anisotropic optical transmittance was demonstrated.