The " diamond and carbon-based nano-structures " sub-axis gather researchers who elaborate diamond -material with a high added value- at different scale (macro, micro or nanocrystalline) together with scientists who finely analyze carbon nano-structures (CNTs, graphene,..) or who study OLEDs. The electronic properties of carbon structures are studied in detail. Applications concern photonic devices, electronics including power electronics and molecular electronics, detectors, etc. The rationale for the carbon-based nano-structures and diamond is that they can be elaborated with the adapted purity and structusre. Other challenges are to be able to produce them in large scale and to make them amenable to a vast variety of chemical, electrochemical and physical treatments prior to their use as components in high-tech devices.
Lspm, in collaboration with ITODYS, LPL, MPQ and the Ile de France diamond-network, will focus on overcoming the scientific and technological bottelnecks that are still preventing diamond from playing a central role in the field of electronics (especially power-electronics), in opto-electronics and photonics. These efforts will include :
Carbon nanostructures
CNTs. Based on the deep understanding of the local spectroscopy of carbon nanotubes MPQ Lab will study the functionalization and doping of CNTs by STM in order to reveal their influence on the electronic structure of CNTs. In collaboration with LSPM that is able to produce pure or functionalized CNTs or BN and BCN nanotubes, the local electronic structure of these tubes and the effect of their functionalization down to the atomic scale will be studied. Using local spectroscopy, a large range of carbon based model systems for molecular electronics can be investigated. Diamond crystals will be studied by STM as well thanks to a new collaboration between MPQ and LSPM. These local STM studies will be completed by transport measurements.
is a simple test molecule before more complex molecules will be used after synthesis at ITODYS. C60 molecules will be deposited in situ at 4 K inside a nanogap after the electromigration process in order to investigate how the experimental signatures of quantum transport are modified in presence of a molecule and how the molecular levels interact with the electronic and spin degrees of freedom in the electrodes. Graphene. The main topic of this research will be the observation of spin and charge collective excitations in graphene in the quantum Hall effect regime and the study of the resonant coupling between vibrational and electronic degrees of freedom of the graphene layer using an optical tool inelastic light scattering, also known as Raman scattering. The experimental set-up developed at MPQ (SQUAP team) will be based on a split-coil magnet specially designed for optical studies and capable of reaching magnetic fields of 10T and temperatures as low as 1.5K. If successful it may pave the way to future Raman studies of electronic properties of other promising two-dimensional crystals like chalcogenides.