Abstract
Current-voltage characteristics of ${\text{H}}_{2}\text{-Au}$ molecular junctions exhibit intriguing steps around a characteristic voltage of ${V}_{s}\ensuremath{\approx}40\text{ }\text{mV}$. Surprisingly, we find that a hysteresis is connected to these steps with a typical time scale $>10\text{ }\text{ms}$. This time constant scales linearly with the power dissipated in the junction beyond an off-set power ${P}_{s}=I{V}_{s}$. We propose that the hysteresis is related to vibrational heating of both the molecule in the junction and a set of surrounding hydrogen molecules. Remarkably, by stretching the junction the hysteresis' characteristic time becomes $>\text{days}$. We demonstrate that reliable switchable devices can be built from such junctions.
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