As reported this week in Nature Communications, the researchers used the atomically-sharp tip of a scanning tunneling microscope to move 1-nanometer sized molecules on top of a silver substrate. The tip is controlled with such great accuracy that it is possible to precisely choose the position of each molecule and build tiny molecular squares, crosses, and chains of controlled size and orientation. The same tip is then used as a mobile electrode to probe the electrical conductivity of the molecules as a function of their position in the array. Figures a-d show an example of such measurements: a represent the topography of a "sudoku" molecular cluster, whereas b-d show regions of high conductivity at different voltages. At low voltage, electrons prefer to pass through the corner molecules, whereas at high voltage, only the central molecule is conducting. This is so because the conductivity depends strongly on a small set of electronic states, which conduct electricity to the substrate, and these are modified by the presence of side-to-side neighbors.
The molecular conductance was found to vary strongly not only from one molecule to another, but also within each molecule, due to the possibility of exploiting different electron transport channels at different positions. Such conduction channels arise from the excitation of internal degrees of freedom of the molecules, such as atomic vibrations and magnetic coupling of the electronic spins. All together, these results demonstrate the intricacy and beauty of molecular electronics, providing a glimpse of its advantages, such as the fabrication of versatile miniaturized circuits, and challenges, which may prove harder to solve than a sudoku game.
Spin coupling and relaxation inside molecule-metal contacts
Aitor Mugarza1,2*, Cornelius Krull1,2, Roberto Robles2, Sebastian Stepanow1,2, Gustavo Ceballos1,2, Pietro Gambardella1,2,3,4
1 Catalan Institute of Nanotechnology (ICN), UAB Campus, E-08193 Barcelona, Spain
2 Centre d'Investigacions en Nanociència i Nanotecnologia (CIN2), UAB Campus, E-08193 Barcelona, Spain
3 Institució Catalana de Recerca i Estudis Avançats (ICREA)
4 Departament de Física, Universitat Autonoma de Barcelona, E-08193 Barcelona, Spain
On-line versión will be published 4 October de 2011 a las 18:00 horas
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