Kondo effect in charge transfer complexes

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This proposal aims to grow ultra thin films of charge transfer (CT) complexes on conducting surfaces and thin insulating layers, and to study their electronic structure. In bulk, CT salts present interesting phenomena characteristic of correlated electrons. In thin films, these remain unexplored. We envisage importing to the monolayer regime some of the low dimensional and many body effects found in bulk. Our previous results indicate that one-dimensional ordering takes place already at the interface of a metal, with evidence of one-dimensional electronic bands. We plan to resolve if CT exists at the interface, to enhance the molecular character of the electronic bands (i.e. electron mobility) by enhancing overlap between molecular π-states through the weakening of the strength of molecule-substrate interactions. Our goal is to resolve molecular fingerprints, characteristic of their chemical state, and non-local states, indicative of electronic dispersion, using low temperature scanning tunnelling spectroscopy, and to modify them, employing concerted doping.