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Dependence of single-molecule conductance on molecule junction symmetry
Authors:Taniguchi Masateru  Tsutsui Makusu  Mogi Ryoji  Sugawara Tadashi  Tsuji Yuta  Yoshizawa Kazunari  Kawai Tomoji
Institution:The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan. taniguti@sanken.osaka-u.ac.jp
Abstract:The symmetry of a molecule junction has been shown to play a significant role in determining the conductance of the molecule, but the details of how conductance changes with symmetry have heretofore been unknown. Herein, we investigate a naphthalenedithiol single-molecule system in which sulfur atoms from the molecule are anchored to two facing gold electrodes. In the studied system, the highest single-molecule conductance, for a molecule junction of 1,4-symmetry, is 110 times larger than the lowest single-molecule conductance, for a molecule junction of 2,7-symmetry. We demonstrate clearly that the measured dependence of molecule junction symmetry for single-molecule junctions agrees with theoretical predictions.
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