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Electronic Structure of Self-Assembled Ag Nanowires on Si(557): Spectroscopic Evidence for Dimensionality

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons61173

Nicholson,  Christopher
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21640

Horn,  Karsten
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22250

Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Zitation

Nicholson, C., Monney, C., Krieg, U., Tegenkamp, C., Pfnür, H. E., Horn, K., et al. (2015). Electronic Structure of Self-Assembled Ag Nanowires on Si(557): Spectroscopic Evidence for Dimensionality. New Journal of Physics, 17(9): 093025. doi:10.1088/1367-2630/17/9/093025.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0028-34BF-5
Zusammenfassung
We investigate the electronic structure of silver nanowires at 1 monolayer (ML) Ag coverage on a vicinal Si(557) substrate by angle-resolved photoemission spectroscopy. Fermi surface mapping reveals two-dimensional (2D) Ag-induced electron pockets, which shift to higher binding energies by n-type doping of the step edges. The electronic structure of the 1 ML Ag/Si(557) system exhibits additional 2D metallic states near the Fermi level, which may originate from substrate induced periodicities. By considering the confining potential and electronic coherence length we reconcile the seemingly conflicting views of the dimensionality in this system probed by photoemission spectroscopy, and the dispersion of collective excitations as detected by electron energy loss spectroscopy .