A Nanosized Molybdenum Oxide Wheel with a Unique Electronic-Necklace Structure: STM Study with Submolecular Resolution


  • F.L.S. thanks Fundação para a Ciência e a Tecnologia (FCT, Portugal) for the Ph.D. scholarship No. SFRH/BD/16284/2004. We thank Prof. Dr. E. Diemann for helpful discussions and Dr. Hartmut Bögge for the construction of Figure 1. A.M. gratefully acknowledges the continuous financial support of the Deutsche Forschungsgemeinschaft (DFG). D.Z., L.F.C., and H.F. gratefully acknowledge the financial support of a Transregional project TRR61 of the Deutsche Forschungsgemeinschaft. H.F. gratefully acknowledges support from the WCU program of the Korean Ministry of Education, Science and Technology at GIST/DNE, Gwangju, South Korea.


original image

The electrons go in two by two: Scanning tunneling microscopy (STM)/spectroscopy (STS), shows the Mo154 giant wheel cluster to have a unique localization of states within each of the 14 identical compartments forming its necklace-type structure (see picture). Each compartment contains two delocalized electrons. These states make the system different from conventional quantum dots that have completely free electrons or excitonic states.