Theoretical analysis of STM-derived lifetimes of excitations in the Shockley surface state band of Ag(111)

Details Theoretical analysis of STM-derived lifetimes of excitations in the Shockley surface state band of Ag(111) Theoretical analysis of STM-derived lifetimes of excitations in the Shockley surface state band of Ag(111)

2005-11-29

arxiv.org/abs/cond-mat/0511695v1

Phys. Rev. B 73, 81402 (2006)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.73.081402

We present a quantitative many-body analysis using the GW approximation of the decay rate $\Gamma$ due to electron-electron scattering of excitations in the Shockley surface state band of Ag(111), as measured using the scanning tunnelling microscope (STM). The calculations include the perturbing influence of the STM, which causes a Stark-shift of the surface state energy $E$ and concomitant increase in $\Gamma$. We find $\Gamma$ varies more rapidly with $E$ than recently found for image potential states, where the STM has been shown to significantly affect measured lifetimes. For the Shockley states, the Stark-shifts that occur under normal tunnelling conditions are relatively small and previous STM-derived lifetimes need not be corrected.

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