Atomic Motion in Single H$_{2}$ and D$_{2}$ Molecule Junction Induced by Phonon Excitation

We have investigated Au atomic contacts in H $_{2}$ and D $_{2}$ environment by conductance measurement and $d I / d V$ spectroscopy. A single H $_{2}$ or D $_{2}$ molecule was found to bridge Au electrodes. In the case of the Au/H $_{2}$ /Au junction, symmetric peaks were observed in $d I / d V$ spectra, while they were not observed for the Au/D $_{2}$ /Au junction. The shape of the peaks in $d I / d V$ spectra originated from the structural change of the single molecule junction induced by the phonon excitation. The structural change could occur only for the Au/H $_{2}$ /Au junction. The difference in the two single molecule junctions could be explained by larger zero point energy of Au-H $_{2}$ vibration mode than that in the Au/H $_{2}$ /Au junction.

Atomic Motion in Single H $_{2}$ and D $_{2}$ Molecule Junction Induced by Phonon Excitation

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Atomic Motion in Single H $_{2}$ and D $_{2}$ Molecule Junction Induced by Phonon Excitation

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Atomic Motion in Single H22​ and D22​ Molecule Junction Induced by Phonon Excitation

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Atomic Motion in Single H22​ and D22​ Molecule Junction Induced by Phonon Excitation

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Atomic Motion in Single H $_{2}$ and D $_{2}$ Molecule Junction Induced by Phonon Excitation

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Atomic Motion in Single H $_{2}$ and D $_{2}$ Molecule Junction Induced by Phonon Excitation

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