An elastic "sieve" to probe momentum space: Gd chains on W(110).
Electron scattering conditions of one-dimensional nanostructures are explored in angle-resolved photoelectron spectroscopy. Tiny increments of the Gd submonolayer coverage on W(110) lead to strong modifications in the spectra. It is shown that the Gd overlayer represents an elastic superlattice of chains which performs a systematic mapping of the electronic band dispersion of the W substrate through a quasicontinuous series of umklapp wave vectors. Conversely, a single valence-band spectrum contains essential and precise structural information readily accessible by comparison to the band dispersion.
Rader
O
O
BESSY, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.
Shikin
A M
AM