Porteur : Mortessagne Fabrice
Using microwave resonators sandwiched between two metallic plates we are able to study experimentally one and two dimensional tight-binding systems. Graphene, a monolayer of Carbon atoms has been realized by André Geim and Konstantin Novoselov at the University of Manchester in 2004. The atoms form a honeycomb lattice and its band structure has the peculiarity that at a specific energy the dispersion relation corresponds to the dispersion relation of the Dirac equation, the reason why this energy is called the Dirac point. Thus graphene can be used to study relativistic effects in a non relativistic system.
Meanwhile artificial graphene, i.e., systems having a hexagonal structure have been becoming a research topic by itself allowing a variety of manipulations till now not possible in real graphene. As graphene is a very promising candidate for tomorrows semiconductor industry its transport properties at the Fermi energy are extremely relevant. The transport in finite graphene flakes is often dominated by edge states. MOSAIQ investigates on the one hand side edge states in unperturbed graphene lattices but also the creation and the structure in deformed lattices.
Apart from the research on graphene, other topics related to tight binding systems can be realized, like Dirac oscillators, small and larger molecules, topologically protected states, or quantum search algorithms.
MOSAIQ, Physique Mésoscopique
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