Role of the electric field in surface electron dynamics above the vacuum level

Details Role of the electric field in surface electron dynamics above the vacuum level Role of the electric field in surface electron dynamics above the vacuum level

2007-03-26

arxiv.org/abs/cond-mat/0703666v1

Physics

Condensed Matter

Materials Science

7 pages, 4 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.75.165326

Scanning tunneling spectroscopy (STS) is used to study the dynamics of hot electrons trapped on a Cu(100) surface in field emission resonances (FER) above the vacuum level. Differential conductance maps show isotropic electron interference wave patterns around defects whenever their energy lies within a surface projected band gap. Their Fourier analysis reveals a broad wave vector distribution, interpreted as due to the lateral acceleration of hot electrons in the inhomogeneous tip-induced potential. A line-shape analysis of the characteristic constant-current conductance spectra permits to establish the relation between apparent width of peaks and intrinsic line-width of FERs, as well as the identification of the different broadening mechanisms.

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