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95. 


Tuning the conductance of a molecular switch



M. del Valle, R. Gutiérrez, C. Tejedor, and G. Cuniberti

Nature Nanotechnology 2, 176 (2007)

One key element to realize nanoscale electronics is the ability to manipulate in a controlled way the conductance of single molecules. Azobenzene, which undergoes a trans-cis isomerization transition upon irradiation, offers the possibility to realize a conformational, light-driven molecular switch. It is thus crucial to clarify the electrical transport characteristics of this molecule. Here, we investigate theoretically charge transport in a system consisting of carbon nanotubes (CNTs) acting as electrodes which are bridged by cis/trans azobenzene. In clear contrast to Au-electrodes, CNTs can act as true nanoscale electrodes, inducing a strong chirality-dependent renormalization of electronic states near the Fermi level. The low energy conduction properties may thus be dramatically modified by changing the molecule-CNT contact topology and/or the tubes chirality. We propose some possible experimental ways to realize a controlled electrical switching with CNT electrodes



online .pdf paper (for personal use only)online .pdf paper (for personal use only)
doi absolute link10.1038/nnano.2007.38
publisher site (ISSN:1748-3395)
online abstractarXiv preprint: 0705.0527
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