Surface imaging of inelastic Friedel oscillations

Details Surface imaging of inelastic Friedel oscillations Surface imaging of inelastic Friedel oscillations

2007-01-24

arxiv.org/abs/cond-mat/0701606v2

Phys. Rev. B, 75, 195337 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures; submitted; new version with minor modifications to match the published paper

Scientific paper

10.1103/PhysRevB.75.195337

Impurities that are present on the surface of a metal often have internal degrees of freedom. Inelastic scattering due to impurities can be revealed by observing local features seen in the tunneling current with scanning tunneling microscope (STM). We consider localized vibrational modes coupled to the electronic structure of a surface. We argue that vibrational modes of impurities produce Fermi momentum $k_F$ oscillations in second derivative of current with respect to voltage $\partial^2I(\br, V)/\partial V^2$. These oscillations are similar to the well known Friedel oscillations of screening charge on the surface. We propose to measure inelastic scattering generated by the presence of the vibrational modes with STM by imaging the $\partial^2I/\partial V^2$ oscillations on the metal surface.

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