Diffusion of Hydrogen in Pd Assisted by Inelastic Ballistic Hot Electrons

Details Diffusion of Hydrogen in Pd Assisted by Inelastic Ballistic Hot Electrons Diffusion of Hydrogen in Pd Assisted by Inelastic Ballistic Hot Electrons

2012-03-15

arxiv.org/abs/1203.3327v1

PRL 108, 115902 (2012)

Physics

Condensed Matter

Materials Science

5 pages and 4 figures

Scientific paper

10.1103/PhysRevLett.108.115902

Sykes {\it et al.} [Proc. Natl. Acad. Sci. {\bf 102}, 17907 (2005)] have reported how electrons injected from a scanning tunneling microscope modify the diffusion rates of H buried beneath Pd(111). A key point in that experiment is the symmetry between positive and negative voltages for H extraction, which is difficult to explain in view of the large asymmetry in Pd between the electron and hole densities of states. Combining concepts from the theory of ballistic electron microscopy and electron-phonon scattering we show that H diffusion is driven by the $s$-band electrons only, which explains the observed symmetry.

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