Bistability of single 1,5 cyclooctadiene molecules on Si(001) |
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Authors: | Christophe Nacci Jérôme Lagoute Xi Liu Stefan Fölsch |
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Institution: | 1.Paul-Drude-Institut für Festk?rperelektronik,Berlin,Germany |
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Abstract: | The adsorption and current-induced bistability of single 1,5 cyclooctadiene molecules on Si(001) were studied in ultrahigh
vacuum by low-temperature scanning tunneling microscopy (STM). After a dosage of ≈0.05 L at room temperature followed by cooling
to the measuring temperature of 7 K, we find that the cyclic alkene molecule preferably adsorbs in the bridge structure with
both C=C double bonds reacting with two adjacent Si dimers via 2+2] cycloaddition reaction. The time-dependent current measured
upon tunneling through the adsorbed molecule at fixed STM tip height displays a switching between two current levels with
the same mean residence time in each level. Higher bias and/or reduced tip height—and therefore higher current—increase the
switching rate, suggesting that the reversible switching is due to inelastic electron tunneling. The observed bistability
is interpreted as a dynamic interconversion between two degenerate conformations of the adsorbed molecule. |
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Keywords: | PACS" target="_blank">PACS 68 37 Ef 68 43 Fg 68 47 Fg 82 37 Gk |
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