Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2004-05-17
Physics
Condensed Matter
Other Condensed Matter
8 pages including 4 figures
Scientific paper
10.1103/PhysRevB.70.125414
We analyse theoretically a relation between the vibrational generation rate of a single adsorbate by tunneling electrons and the inelastic tunneling (IET) current in scanning tunneling microscope, and the influence of the vibrational excitations on the rate of adsorbate motions. Special attention is paid to the effects of finite lifetime of the vibrational excitations. We show that in the vicinity and below the IET threshold the rate of adsorbate motion deviates from a simple power-law dependence on the bias voltage due to the effects of bath temperature and adsorbate vibrational lifetime broadenings. The temperature broadening appears to be confined near the threshold voltage within a narrow region of several $k_B T$, whereas the lifetime broadening manifests itself in a much wider region of applied voltages below the IET threshold.
Tikhodeev Sergei G.
Ueba Hiromu
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