Vibrationally induced flip motion of a hydroxyl dimer on Cu(110)

Details Vibrationally induced flip motion of a hydroxyl dimer on Cu(110) Vibrationally induced flip motion of a hydroxyl dimer on Cu(110)

2011-11-09

arxiv.org/abs/1111.2252v1

Phys. Rev. B 84, 193403 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.193403

Recent low-temperature scanning-tunneling microscopy experiments [T. Kumagai et al., Phys. Rev. B 79, 035423 (2009)] observed the vibrationally induced flip motion of a hydroxyl dimer (OD)2 on Cu(110). We propose a model to describe two-level fluctuations and current-voltage characteristics of nanoscale systems which undergo vibrationally induced switching. The parameters of the model are based on comprehensive density-functional calculations of the system's vibrational properties. For the dimer (OD)2 the calculated population of the high and low conductance states, the I-V, dI/dV, and d2I/dV2 curves are in good agreement with the experimental results and underlines the different roles played by the free and shared OD stretch modes of the dimer.

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