Theis, W.; Rotenberg, E.; Franke, K. J.; Gille, Peter; Horn, K.
Electronic valence bands in decagonal Al-Ni-Co.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 68, No. 10: pp. 1042051-1042054
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Valence-band photoemission from the s-p region of the tenfold and the two inequivalent twofold surfaces of quasicrystalline decagonal Al 72.8Ni14.8Co13.4 reveals strongly dispersing bands. These exhibit a free-electron-like dispersion along quasiperiodic and periodic directions of the decagonal quasicrystal. The experimental photoemission maps are reproduced in detail by a model in which parabolic bands emanate from a set of reciprocal lattice vectors. A parity rule for the principal zone centers is observed.