Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-06-26
Physical Review B 80, 081407 (R) (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Submitted to Phys. Rev. Lett
Scientific paper
Current-voltage characteristics of H2-Au molecular junctions exhibit intriguing steps around a characteristic voltage of 40 mV. Surprisingly, we find that a hysteresis is connected to these steps with a typical time scale > 10 ms. This time constant scales linearly with the power dissipated in the junction beyond an ofset power P_s = IV_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, we can engineer our junctions such that the hysteresis' characteristic time becomes >days. We demonstrate that reliable switchable devices can be built from such junctions.
der Molen Sense Jan van
Huisman Everardus H.
Trouwborst Marius L.
van Wees Bart Jan
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