Physics – Condensed Matter – Materials Science
Scientific paper
1998-10-19
Phys. Rev. Lett. {\bf 81}, 4963 (1998)
Physics
Condensed Matter
Materials Science
5 pages, RevTex, 4 postscript figures, http://www.icmm.csic.es/Pandres/pedro.htm
Scientific paper
10.1103/PhysRevLett.81.4963
Applying a Keldysh Green`s function method it is shown that hot electrons injected from a STM-tip into a CoSi${}_2$/Si(111) system form a highly focused beam due to the silicide band structure. This explains the atomic resolution obtained in recent Ballistic Electron Emission Microscopy (BEEM) experiments. Localized surface states in the $(2 \times 1)$-reconstruction are found to be responsible for the also reported anticorrugation of the BEEM current. These results clearly demonstrate the importance of bulk and surface band structure effects for a detailed understanding of BEEM data.
de Andres Pedro L.
Flores Fernando
Garcia-Vidal Francisco J.
Heinz K.
Reuter Karsten
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