Wednesday, October 24, 2012

Probing the conductance superposition law in single-molecule circuits with parallel paths

H. Vazquez, R. Skouta, S. Schneebeli, M. Kamenetska, R. Breslow, L. Venkataraman & M.S. Hybertsen
This paper presents experimental evidence that a parallel circuit in molecular electronics setting does not obey the Kirchhoff Rule, which states that the conductance of a parallel circuit is a sum of the parallel parts.  In this case, quantum interference is held as the culprit, giving rise to higher conductance! (actual conductance ~ 1.5 x that predicted by Kirchhoff).  Measurements were done using STM-break junction experiments, as well as DFT. 

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