Parametrização de potenciais para a obtenção de grafeno artificial em uma superfície de hélio líquido

Abstract

We suggest an alternative way for producing artificial graphene by using trapped electrons on a liquid helium surface. In the proposed system, electrons attached to the planar liquid helium surface, due to dielectric mismatch between vacuum and helium, are submitted to an extra lateral confinement due to image charge efects induced by gold spheres deposited as a honeycomb lattice just above the substrate in which the liquid helium is deposited. Our theoretical investigation shows that, besides being a highly pure system, ideal for experimental verification of the unique physical phenomena that occur in graphene, the proposed system is highly controllable, so that its effective Fermi velocity, hopping energies and lattice spacing can be adjusted just by varying liquid helium para meters that are easily experimentally tunable.